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These are the user uploaded subtitles that are being translated: 1 00:00:13,000 --> 00:00:16,000 Over 300,000 years ago, 2 00:00:16,000 --> 00:00:20,520 Africa was the cradle of humanity - 3 00:00:20,520 --> 00:00:23,840 the place where humans evolved, 4 00:00:23,840 --> 00:00:26,800 including the first of a new species... 5 00:00:27,800 --> 00:00:29,400 ..Homo sapiens... 6 00:00:30,600 --> 00:00:32,040 ..our species. 7 00:00:33,120 --> 00:00:36,840 From humble beginnings, our growing culture 8 00:00:36,840 --> 00:00:41,760 and connections helped us spread across that great continent. 9 00:00:43,000 --> 00:00:45,880 And then we ventured outwards, 10 00:00:45,880 --> 00:00:50,160 away from our home, and into the wider world. 11 00:01:16,160 --> 00:01:20,680 Our ancestors did something which is actually remarkable. 12 00:01:20,680 --> 00:01:24,480 From a beach not unlike this one, 13 00:01:24,480 --> 00:01:27,200 possibly quite close by, 14 00:01:27,200 --> 00:01:30,560 they ventured out into an open ocean, 15 00:01:30,560 --> 00:01:34,160 with only an empty horizon in front of them. 16 00:01:35,720 --> 00:01:38,760 And after many days and nights on the water, 17 00:01:38,760 --> 00:01:42,720 they eventually came upon this new landmass that they would settle. 18 00:01:42,720 --> 00:01:45,960 We call that landmass Australia. 19 00:01:45,960 --> 00:01:50,160 It was a pivotal moment in the history of our species. 20 00:01:52,320 --> 00:01:56,360 But in so many ways, it's not actually the destination 21 00:01:56,360 --> 00:01:57,800 that's important. 22 00:01:57,800 --> 00:01:59,920 It is everything it took - 23 00:01:59,920 --> 00:02:02,600 all the challenges they had to overcome 24 00:02:02,600 --> 00:02:07,000 to make it so far away from where they began, in Africa. 25 00:02:10,720 --> 00:02:13,520 We were not the first humans to leave Africa. 26 00:02:15,840 --> 00:02:17,840 Long before we evolved, 27 00:02:17,840 --> 00:02:19,680 the ancestors of our cousins, 28 00:02:19,680 --> 00:02:21,680 the Neanderthals, set out. 29 00:02:23,000 --> 00:02:27,160 And Homo erectus, one of the most ancient humans, 30 00:02:27,160 --> 00:02:29,960 had made it deep into Asia. 31 00:02:35,240 --> 00:02:39,520 But none had ever made the voyage to Australia. 32 00:02:41,920 --> 00:02:46,440 Every other species of human reached a point, and then they just stopped. 33 00:02:46,440 --> 00:02:50,680 They faced a barrier that they either could not or would not pass. 34 00:02:50,680 --> 00:02:53,320 But not us. 35 00:02:53,320 --> 00:02:56,360 This is the story of how, time and again, 36 00:02:56,360 --> 00:02:58,960 we took on perilous journeys - 37 00:02:58,960 --> 00:03:02,160 how the last species of human to evolve 38 00:03:02,160 --> 00:03:05,640 took on environments like no others had, 39 00:03:05,640 --> 00:03:10,520 to become the only global species of human. 40 00:03:10,520 --> 00:03:14,560 That title is ours and ours alone. 41 00:03:28,440 --> 00:03:32,880 This story begins over 120,000 years ago. 42 00:03:34,160 --> 00:03:37,960 As our species spreads beyond the borders of Africa... 43 00:03:38,960 --> 00:03:43,240 ..they're blocked by expanses of oceans on most sides. 44 00:03:44,320 --> 00:03:48,880 One of the few places they can go is east - 45 00:03:48,880 --> 00:03:52,040 to the vast landmass that today is made up of 46 00:03:52,040 --> 00:03:53,920 Arabia and the Levant... 47 00:04:00,120 --> 00:04:04,560 ..at this time one of the few gateways out of Africa 48 00:04:04,560 --> 00:04:06,400 to the rest of the world. 49 00:04:55,800 --> 00:04:59,840 Of all the species of human that have ever existed, 50 00:04:59,840 --> 00:05:02,800 I think we, Homo sapiens, 51 00:05:02,800 --> 00:05:04,920 are the explorer species. 52 00:05:04,920 --> 00:05:08,080 We can't help it - we have to wander. 53 00:05:12,920 --> 00:05:15,440 It is in our wont to travel. 54 00:05:16,920 --> 00:05:20,000 And this place was the landmass next door. 55 00:05:20,000 --> 00:05:22,720 You could see it from Africa. 56 00:05:22,720 --> 00:05:27,680 And look at it! It is absolutely breathtaking. 57 00:05:30,280 --> 00:05:32,160 But it's not exactly welcoming. 58 00:05:32,160 --> 00:05:35,600 Nothing about this place says home. 59 00:05:38,040 --> 00:05:39,840 And so, the question is, 60 00:05:39,840 --> 00:05:43,120 why did Homo sapiens come here? 61 00:05:47,640 --> 00:05:49,920 We know they did, 62 00:05:49,920 --> 00:05:54,080 {\an8}thanks to finds from Israel and Saudi Arabia, 63 00:05:54,080 --> 00:05:55,720 {\an8}to the Gulf States. 64 00:05:59,360 --> 00:06:03,640 {\an8}And even beyond - to the fringes of Europe and Asia. 65 00:06:08,280 --> 00:06:10,240 Which is hard to explain, 66 00:06:10,240 --> 00:06:15,360 when today these lands look just as much of a barrier as any ocean. 67 00:06:20,240 --> 00:06:24,760 I always say archaeology is a bit like a jigsaw puzzle, 68 00:06:24,760 --> 00:06:28,320 and you're just constantly looking for pieces of that puzzle 69 00:06:28,320 --> 00:06:30,360 to help you get the full picture. 70 00:06:30,360 --> 00:06:33,400 And this is one of those pieces. 71 00:06:33,400 --> 00:06:35,600 This particular piece is 72 00:06:35,600 --> 00:06:37,760 a copy of a tooth. 73 00:06:37,760 --> 00:06:40,000 Now, it's a single tooth, which gives you an idea 74 00:06:40,000 --> 00:06:42,240 of how large this animal must have been, 75 00:06:42,240 --> 00:06:44,400 because it's bigger than a brick. It's... 76 00:06:44,400 --> 00:06:46,560 I mean, it's practically the size of my head. 77 00:06:46,560 --> 00:06:49,240 It is the tooth of an extinct elephant, 78 00:06:49,240 --> 00:06:51,760 and it was found in Jordan. 79 00:06:51,760 --> 00:06:54,480 And we also have hippo fossils 80 00:06:54,480 --> 00:06:56,640 from the Saudi desert. 81 00:06:56,640 --> 00:07:00,280 Now, hippos and elephants 82 00:07:00,280 --> 00:07:03,160 do not belong in this landscape. 83 00:07:03,160 --> 00:07:04,560 Look around! 84 00:07:04,560 --> 00:07:06,400 Where's the water? 85 00:07:06,400 --> 00:07:10,200 Hippos actually need standing bodies of water, 86 00:07:10,200 --> 00:07:12,600 and they need greenery. 87 00:07:12,600 --> 00:07:16,200 And that's the thing about some fossils. 88 00:07:16,200 --> 00:07:21,000 They tell us about what a landscape used to look like. 89 00:07:21,000 --> 00:07:24,160 Because these do not belong here. 90 00:07:34,520 --> 00:07:38,040 These finds point to a very different Arabia. 91 00:07:41,360 --> 00:07:44,080 One that, if you know where to look, 92 00:07:44,080 --> 00:07:46,440 you can see hints of to this day. 93 00:07:52,160 --> 00:07:55,600 If you look over there, it almost looks like a mirage - 94 00:07:55,600 --> 00:07:58,400 that white and silver on the landscape. 95 00:07:58,400 --> 00:08:02,000 So that used to be a lake, 96 00:08:02,000 --> 00:08:05,520 and the white and silver is actually salt and gypsum 97 00:08:05,520 --> 00:08:08,240 that was left behind when the water evaporated. 98 00:08:10,120 --> 00:08:13,920 And scientists are really interested in not just ageing them, 99 00:08:13,920 --> 00:08:17,200 but also working out these ancient water systems - 100 00:08:17,200 --> 00:08:19,240 these extinct water systems. 101 00:08:19,240 --> 00:08:22,960 And so one of the ways they do this is by just getting on the ground 102 00:08:22,960 --> 00:08:27,920 and walking these beautiful but incredibly intense landscapes, 103 00:08:27,920 --> 00:08:31,440 looking at maps, looking at satellite images. 104 00:08:31,440 --> 00:08:34,800 And this is the result of some of that work. 105 00:08:35,840 --> 00:08:37,720 Now, if you look here, 106 00:08:37,720 --> 00:08:41,040 this is a map of the region 107 00:08:41,040 --> 00:08:42,280 just slightly north of here. 108 00:08:42,280 --> 00:08:44,160 So this is Saudi, which is to our east, 109 00:08:44,160 --> 00:08:46,600 and that there is the Sinai of Egypt. 110 00:08:46,600 --> 00:08:51,040 You can see it's basically shades of beige and grey. 111 00:08:52,040 --> 00:08:53,800 Now, look! 112 00:08:53,800 --> 00:08:59,040 So this is about 125,000 years ago. 113 00:08:59,040 --> 00:09:02,080 Water litters this landscape. 114 00:09:02,080 --> 00:09:06,080 I mean, you can see the veins just running through. 115 00:09:06,080 --> 00:09:08,560 There is no way that this land 116 00:09:08,560 --> 00:09:10,600 would not have been green. 117 00:09:10,600 --> 00:09:15,080 There are paleo lakes and paleo rivers absolutely everywhere. 118 00:09:19,360 --> 00:09:23,720 And this is this region as we have never known it. 119 00:09:26,360 --> 00:09:30,200 Now, remember, this was a world without borders, 120 00:09:30,200 --> 00:09:33,600 and this was a land of plenty, 121 00:09:33,600 --> 00:09:35,760 within easy reach. 122 00:09:35,760 --> 00:09:38,800 And so why wouldn't Homo sapiens have come here? 123 00:09:49,480 --> 00:09:51,040 But what they didn't know, 124 00:09:51,040 --> 00:09:53,160 what they couldn't have known, 125 00:09:53,160 --> 00:09:56,360 is that this region would be a trap. 126 00:10:04,440 --> 00:10:07,240 The green days of Arabia were numbered. 127 00:10:08,280 --> 00:10:10,840 The desert was on the march. 128 00:10:18,360 --> 00:10:21,640 Subtle variations in the orbit of the Earth 129 00:10:21,640 --> 00:10:23,720 caused the climate to change. 130 00:10:28,160 --> 00:10:33,600 Within as little as a few hundred years, the rains vanished, 131 00:10:33,600 --> 00:10:36,360 starving this entire region of water... 132 00:10:38,240 --> 00:10:42,320 ..leaving humans at the mercy of the desert. 133 00:10:46,800 --> 00:10:49,400 If you set out to create an environment that was completely 134 00:10:49,400 --> 00:10:51,680 and utterly hostile to our biology, 135 00:10:51,680 --> 00:10:53,600 you'd come up with this. 136 00:10:53,600 --> 00:10:55,680 The heat is such a presence 137 00:10:55,680 --> 00:10:57,800 that I can feel it on my back. 138 00:10:57,800 --> 00:11:00,440 The sun, even at this time of the morning, 139 00:11:00,440 --> 00:11:03,520 feels like it's borderline torture. 140 00:11:05,040 --> 00:11:07,480 And there is no water. 141 00:11:07,480 --> 00:11:11,760 As far as the eye can see, there's nothing. 142 00:11:11,760 --> 00:11:14,480 And back then, it would've been so much worse. 143 00:11:14,480 --> 00:11:15,880 It wasn't arid. 144 00:11:15,880 --> 00:11:18,320 It's what we call hyper arid. 145 00:11:18,320 --> 00:11:22,680 It's thought that there was no rainfall for years on end. 146 00:11:22,680 --> 00:11:26,080 And so we go from seeing multiple sites 147 00:11:26,080 --> 00:11:30,120 where humans lived in this region, to nothing. 148 00:11:35,680 --> 00:11:39,040 We seem to vanish for thousands of years. 149 00:11:40,240 --> 00:11:44,400 And this could so easily have been the end of our journey... 150 00:11:48,000 --> 00:11:50,800 ..defeated by the harsh desert. 151 00:11:59,800 --> 00:12:02,520 We think that some Homo sapiens 152 00:12:02,520 --> 00:12:05,280 clung on in pockets that we call refugia. 153 00:12:05,280 --> 00:12:09,080 Those are refuges where the climate is milder. 154 00:12:09,080 --> 00:12:10,960 But from all we can tell, 155 00:12:10,960 --> 00:12:13,640 they would've been few and far between, 156 00:12:13,640 --> 00:12:16,480 and they effectively faded away. 157 00:12:17,560 --> 00:12:19,480 And so, for all intents and purposes, 158 00:12:19,480 --> 00:12:23,240 Homo sapiens outside of Africa had failed. 159 00:12:25,760 --> 00:12:27,760 And what's interesting is 160 00:12:27,760 --> 00:12:30,320 other species of human had cracked 161 00:12:30,320 --> 00:12:34,480 the code of living outside of Africa, but not us. 162 00:12:34,480 --> 00:12:37,200 And so how did this happen? 163 00:12:37,200 --> 00:12:39,920 People like me, so many of you, 164 00:12:39,920 --> 00:12:44,040 how did we become the only species of human 165 00:12:44,040 --> 00:12:46,960 who exists across the globe? 166 00:12:53,520 --> 00:12:56,080 These brutal conditions 167 00:12:56,080 --> 00:12:58,400 persisted for years on end. 168 00:13:06,400 --> 00:13:12,160 Until finally, there was another subtle change in climate... 169 00:13:15,280 --> 00:13:18,400 ..allowing conditions to become less extreme... 170 00:13:25,760 --> 00:13:29,600 ..and giving Homo sapiens another chance. 171 00:13:35,400 --> 00:13:37,840 Occasional seasonal rains returned... 172 00:13:42,960 --> 00:13:47,880 ..just enough to bring precious water back to the desert. 173 00:14:01,280 --> 00:14:03,240 Now, the conditions here did get better. 174 00:14:03,240 --> 00:14:06,320 So, yes, you had desert and sand dunes... 175 00:14:08,240 --> 00:14:10,960 ..but you also had lakes and rivers. 176 00:14:12,800 --> 00:14:18,800 And that resulted in us being able to exist in this place, 177 00:14:18,800 --> 00:14:20,880 but not just exist here. 178 00:14:20,880 --> 00:14:25,360 From an oasis here to a river and spring system there, 179 00:14:25,360 --> 00:14:29,680 we were able to actually leave the Arabian Peninsula 180 00:14:29,680 --> 00:14:32,000 and face the rest of the world. 181 00:14:39,640 --> 00:14:44,400 As they did, these new waves likely absorbed any small pockets 182 00:14:44,400 --> 00:14:47,600 of Homo sapiens that had held on. 183 00:14:50,600 --> 00:14:53,600 And now scientists studying the genetic code 184 00:14:53,600 --> 00:14:58,000 of people alive today believe this moment 185 00:14:58,000 --> 00:15:01,480 was a pivotal point in our history. 186 00:15:07,160 --> 00:15:11,640 Our DNA has the power to tell stories about us, 187 00:15:11,640 --> 00:15:14,720 but some of them aren't just stories, they're sagas, 188 00:15:14,720 --> 00:15:16,920 and they're extraordinary. 189 00:15:16,920 --> 00:15:20,760 And one of them is that every single one of us 190 00:15:20,760 --> 00:15:23,320 whose origins are from outside of Africa 191 00:15:23,320 --> 00:15:26,880 comes from a tiny population of Homo sapiens. 192 00:15:29,640 --> 00:15:35,400 We started in Africa, from multiple populations across the continent, 193 00:15:35,400 --> 00:15:39,600 but then only a small group of us left - 194 00:15:39,600 --> 00:15:43,800 perhaps as few as 10,000 individuals. 195 00:15:46,160 --> 00:15:50,640 And so all of us from outside of Africa 196 00:15:50,640 --> 00:15:54,120 come from this minuscule population, 197 00:15:54,120 --> 00:15:56,320 who went on to populate 198 00:15:56,320 --> 00:15:59,880 not one, not two continents, but five. 199 00:16:09,400 --> 00:16:11,720 But our journey through the desert... 200 00:16:14,400 --> 00:16:18,080 ..was only one of a multitude of challenges 201 00:16:18,080 --> 00:16:20,400 Homo sapiens would face 202 00:16:20,400 --> 00:16:23,200 as we spread across the globe. 203 00:16:25,560 --> 00:16:28,880 And because we were so few in number, 204 00:16:28,880 --> 00:16:32,560 our very survival outside of Africa 205 00:16:32,560 --> 00:16:34,920 was far from certain. 206 00:16:49,040 --> 00:16:52,320 As this tiny population grew and spread... 207 00:16:55,640 --> 00:16:59,560 ..they would crash into another extreme environment. 208 00:17:03,680 --> 00:17:09,160 One that had defeated all other species of human - 209 00:17:09,160 --> 00:17:11,600 a vast green wall. 210 00:17:18,200 --> 00:17:20,000 Once beyond the desert, 211 00:17:20,000 --> 00:17:24,440 our species found themselves in the giant landmass of Europe and Asia. 212 00:17:25,640 --> 00:17:29,640 To their north, lay high, cold mountains. 213 00:17:29,640 --> 00:17:33,200 So many spread eastwards and south, 214 00:17:33,200 --> 00:17:36,960 down through what is now the Indian subcontinent, 215 00:17:36,960 --> 00:17:39,400 reaching modern-day Sri Lanka, 216 00:17:39,400 --> 00:17:41,880 at that time joined to the mainland 217 00:17:41,880 --> 00:17:43,680 by lower sea levels... 218 00:17:50,600 --> 00:17:55,360 ..and dominated by expansive dense rainforests. 219 00:18:05,000 --> 00:18:09,920 And while this may look so much more welcoming than the desert, 220 00:18:09,920 --> 00:18:13,160 nothing could be further from the truth. 221 00:18:20,280 --> 00:18:23,840 These leeches are absolutely everywhere. 222 00:18:23,840 --> 00:18:27,760 And when I say everywhere, I mean, one has just got me. 223 00:18:27,760 --> 00:18:31,360 And there are creepy crawlies absolutely everywhere, 224 00:18:31,360 --> 00:18:33,360 including in our trousers. 225 00:18:33,360 --> 00:18:35,440 And they are actually quite irritating. 226 00:18:37,320 --> 00:18:39,840 This place is also full of mosquitoes. 227 00:18:39,840 --> 00:18:43,840 We saw a viper, and a cobra. 228 00:18:43,840 --> 00:18:46,000 And that's the thing about this place. 229 00:18:46,000 --> 00:18:48,240 It is difficult to exist in. 230 00:18:48,240 --> 00:18:50,680 It's hot, it's humid, it's oppressive, 231 00:18:50,680 --> 00:18:53,360 and you have to constantly have your wits about you. 232 00:19:01,560 --> 00:19:05,800 This is one of the most extreme environments on the planet. 233 00:19:09,000 --> 00:19:12,000 So much of what grows here is poisonous to eat... 234 00:19:14,640 --> 00:19:17,960 ..and there are few large animals to provide meat. 235 00:19:19,240 --> 00:19:22,760 Conditions so difficult 236 00:19:22,760 --> 00:19:24,600 that, as far as we can tell, 237 00:19:24,600 --> 00:19:26,840 no other species of human 238 00:19:26,840 --> 00:19:31,320 ever made it past the fringes of these rainforests. 239 00:20:02,280 --> 00:20:05,040 Being here is a bit like stepping back in time, 240 00:20:05,040 --> 00:20:06,840 because about 50,000 years ago, 241 00:20:06,840 --> 00:20:09,400 this place would have basically looked the same. 242 00:20:09,400 --> 00:20:13,120 This huge cave mouth would've been here. 243 00:20:13,120 --> 00:20:17,640 Only back then, the rainforest would've been unbroken, 244 00:20:17,640 --> 00:20:20,080 and it would've gone on for kilometres 245 00:20:20,080 --> 00:20:22,480 in every single direction. 246 00:20:22,480 --> 00:20:25,720 And yet, somehow, in this cave 247 00:20:25,720 --> 00:20:28,560 and two other caves not far away, 248 00:20:28,560 --> 00:20:33,360 we have found evidence of our ancestors living here, 249 00:20:33,360 --> 00:20:35,160 all the way back then, 250 00:20:35,160 --> 00:20:38,960 in the heart of what would've been a massive rainforest. 251 00:20:43,920 --> 00:20:51,520 So how were Homo sapiens able to plunge into a place no others had? 252 00:20:51,520 --> 00:20:54,880 How did they find food - particularly meat? 253 00:20:56,920 --> 00:21:01,560 They did have the advantage of bow-and-arrow technology, 254 00:21:01,560 --> 00:21:04,480 which had arisen thousands of years earlier. 255 00:21:06,400 --> 00:21:08,760 But heavy, stone-tipped arrows 256 00:21:08,760 --> 00:21:13,080 were less suited to firing into the high canopy of the rainforest. 257 00:21:17,520 --> 00:21:22,880 Their solution was uncovered thanks to over 30 years of excavations 258 00:21:22,880 --> 00:21:27,160 deep into the floor of this - and the two other two caves. 259 00:21:29,440 --> 00:21:32,200 Digs that reach all the way back 260 00:21:32,200 --> 00:21:35,240 to 48,000 years ago, 261 00:21:35,240 --> 00:21:38,040 when the pioneers of our species 262 00:21:38,040 --> 00:21:42,600 first attempted to overcome the challenges of this rainforest. 263 00:21:46,120 --> 00:21:49,520 Starting with one of the most difficult - 264 00:21:49,520 --> 00:21:52,400 how to find enough meat to sustain them. 265 00:22:06,320 --> 00:22:10,000 Yeah. So, this here, that's where somebody is cutting? 266 00:22:10,000 --> 00:22:11,320 Yeah, yeah. 267 00:22:14,200 --> 00:22:15,560 Yeah. 268 00:22:18,600 --> 00:22:21,200 {\an8}Yeah. It's funny, because I think butchery marks, 269 00:22:21,200 --> 00:22:23,840 {\an8}often need to look at it through a magnifying glass, but not always. 270 00:22:23,840 --> 00:22:25,840 {\an8}And actually, this one is quite clear. 271 00:22:25,840 --> 00:22:29,160 {\an8}And this is not the kind of thing that you would see 272 00:22:29,160 --> 00:22:30,440 if an animal killed it. 273 00:22:30,440 --> 00:22:32,680 This is an indication that this is killed by a human. 274 00:22:35,920 --> 00:22:39,760 And so the question is how they killed them. 275 00:23:51,480 --> 00:23:53,200 Right. 276 00:23:55,000 --> 00:23:57,160 So, that chip mark there... 277 00:23:57,160 --> 00:24:00,560 - ..shows us that it was actually used. - Yes. 278 00:24:00,560 --> 00:24:02,480 I mean, it's amazing, because this is obviously... 279 00:24:02,480 --> 00:24:04,160 I've got in my hands right now 280 00:24:04,160 --> 00:24:06,440 something that was used 48,000 years ago. 281 00:24:06,440 --> 00:24:09,480 - Of course, of course. - And it was absolutely revolutionary. 282 00:24:12,280 --> 00:24:16,480 These bone points are only the tips of the full arrowheads. 283 00:24:18,600 --> 00:24:21,600 Many are chipped from actually hitting prey... 284 00:24:23,160 --> 00:24:27,280 ..and each one would have been attached to the end of a long wooden arrow. 285 00:24:32,840 --> 00:24:35,840 These hunters didn't invent a brand-new technology... 286 00:24:40,040 --> 00:24:42,160 ..they adapted an old one. 287 00:24:44,040 --> 00:24:46,480 These are some of the earliest examples of bow 288 00:24:46,480 --> 00:24:48,960 and arrows found outside of Africa... 289 00:24:53,760 --> 00:24:55,960 ..enabling Homo sapiens to hunt 290 00:24:55,960 --> 00:25:00,640 with exceptional skill and efficiency within the forest. 291 00:25:20,840 --> 00:25:23,200 But we know that the humans living here 292 00:25:23,200 --> 00:25:25,760 were doing more than just surviving. 293 00:25:39,280 --> 00:25:43,800 Oshan and the team also found beads fashioned from shells. 294 00:25:48,720 --> 00:25:52,040 Perhaps brought in through trade from groups living on the coast. 295 00:25:53,840 --> 00:25:55,760 A constant struggle to survive... 296 00:25:57,480 --> 00:26:00,240 ..doesn't leave much time for making works of art.. 297 00:26:05,720 --> 00:26:10,800 ..suggesting a long-established and successful community existed here. 298 00:26:20,560 --> 00:26:25,040 And for that, to turn this place into a true home 299 00:26:25,040 --> 00:26:28,800 would take something fundamental to our species. 300 00:26:36,520 --> 00:26:39,000 This is... 301 00:26:39,000 --> 00:26:40,040 ..a replica... 302 00:26:42,160 --> 00:26:45,200 ..of a tool that was found in the caves 303 00:26:45,200 --> 00:26:47,680 in this area, dated from about 40,000 years ago. 304 00:26:49,280 --> 00:26:54,560 It is a monkey tooth, specifically a canine, but that's been modified. 305 00:26:54,560 --> 00:26:57,440 If you look here, it's been cut into, 306 00:26:57,440 --> 00:26:59,600 to create a much sharper point. 307 00:27:00,600 --> 00:27:02,080 And the reason for that... 308 00:27:03,600 --> 00:27:07,360 ..is that it's a tool used for puncturing. 309 00:27:09,200 --> 00:27:10,920 Oh. 310 00:27:10,920 --> 00:27:12,320 It's not easy. 311 00:27:15,200 --> 00:27:19,800 All right, look, I've finally managed to make a hole. 312 00:27:21,200 --> 00:27:25,720 And once you make a hole, you can then use plant fibre, 313 00:27:25,720 --> 00:27:30,880 animal sinew, as a string, start stringing animal skins, 314 00:27:30,880 --> 00:27:33,080 animal hide together, and create clothes. 315 00:27:34,280 --> 00:27:37,000 But actually, in so many ways, 316 00:27:37,000 --> 00:27:40,000 that's not the most interesting thing about this tool. 317 00:27:41,160 --> 00:27:44,760 Because for me, the most interesting thing is what this tells us 318 00:27:44,760 --> 00:27:47,720 about the minds of the people who have made it. 319 00:27:47,720 --> 00:27:50,400 Because you have to be taught how to use it. 320 00:27:50,400 --> 00:27:53,000 You have to be taught how to make it. 321 00:27:54,400 --> 00:27:56,840 So it actually tells us something much deeper. 322 00:28:03,400 --> 00:28:07,520 Throughout the years humans made this cave their home, 323 00:28:07,520 --> 00:28:09,040 countless elder generations 324 00:28:09,040 --> 00:28:11,800 would have taught children these techniques. 325 00:28:15,000 --> 00:28:17,120 Something we still do to this day. 326 00:28:18,560 --> 00:28:23,200 A communal passing on of knowledge that is key to our ability 327 00:28:23,200 --> 00:28:26,240 to master so many different environments. 328 00:28:35,160 --> 00:28:38,040 That engagement, constant engagement, 329 00:28:38,040 --> 00:28:41,200 turns every generation of children 330 00:28:41,200 --> 00:28:44,040 into a step in the evolution of knowledge. 331 00:28:44,040 --> 00:28:48,720 And for us Homo sapiens, that's probably what adaptation is, 332 00:28:48,720 --> 00:28:51,120 the evolution of knowledge, 333 00:28:51,120 --> 00:28:55,280 because it's what turns a simple projectile like a bow and arrow 334 00:28:55,280 --> 00:29:01,640 into a weapon fine-tuned, honed, and specialised for the rainforest. 335 00:29:01,640 --> 00:29:07,600 And that constant innovation unlocks resources that were 336 00:29:07,600 --> 00:29:11,440 completely out of reach to other species of human. 337 00:29:12,600 --> 00:29:14,440 Resources like the rainforest. 338 00:29:27,320 --> 00:29:30,040 And it's this ongoing evolution of tools 339 00:29:30,040 --> 00:29:36,840 and techniques that has allowed our species, time and again, 340 00:29:36,840 --> 00:29:42,080 to live and thrive even in extreme environments. 341 00:29:47,200 --> 00:29:49,720 That is the strength of our species, 342 00:29:49,720 --> 00:29:52,600 that we were opening up so many new environments, 343 00:29:52,600 --> 00:29:57,920 places that previously other species saw as impenetrable, 344 00:29:57,920 --> 00:30:02,480 as too difficult, we saw as having long-term potential, 345 00:30:02,480 --> 00:30:05,080 and we were able to expand in number, 346 00:30:05,080 --> 00:30:07,800 we were able to then adapt to it. 347 00:30:07,800 --> 00:30:12,080 And as we grew, some people would decide to move on 348 00:30:12,080 --> 00:30:14,760 to yet another environment. 349 00:30:14,760 --> 00:30:19,240 We were becoming a species with truly global potential. 350 00:30:27,040 --> 00:30:31,320 It was that ability to take on so many different, challenging 351 00:30:31,320 --> 00:30:35,600 environments that carried us through so much of the world... 352 00:30:37,800 --> 00:30:39,840 ..by now, to the fringes of Europe... 353 00:30:41,880 --> 00:30:44,520 ..into the cold expanses of northern Asia... 354 00:30:48,280 --> 00:30:52,800 ..and, within only a few thousand years of leaving Africa, 355 00:30:52,800 --> 00:30:54,280 deep into Southeast Asia. 356 00:30:56,720 --> 00:31:01,880 Lower sea levels had created a single region known as Sunda... 357 00:31:04,480 --> 00:31:08,280 ..where today there are sweeping stretches of tropical waters. 358 00:31:10,320 --> 00:31:12,760 Our wandering feet brought us to its outer edge. 359 00:31:17,920 --> 00:31:23,880 Beyond lay an ocean, dotted with isolated islands. 360 00:31:35,760 --> 00:31:38,640 There are these places that you turn up to and you think, 361 00:31:38,640 --> 00:31:41,080 "I'm on the edge of the world." 362 00:31:41,080 --> 00:31:44,280 They are incredibly remote and isolated, 363 00:31:44,280 --> 00:31:46,680 and this is one of those places. 364 00:31:46,680 --> 00:31:48,920 And it's been like this since the very beginning, 365 00:31:48,920 --> 00:31:50,240 since its formation, 366 00:31:50,240 --> 00:31:53,280 because it's been surrounded by this very deep sea, 367 00:31:53,280 --> 00:31:57,600 which makes what was found here even more intriguing, 368 00:31:57,600 --> 00:32:01,800 because a mind-boggling, completely unexpected human history 369 00:32:01,800 --> 00:32:05,120 plays out here over hundreds of thousands of years. 370 00:32:10,840 --> 00:32:12,840 Even all those years ago, 371 00:32:12,840 --> 00:32:15,680 the ocean could not stop the spread of our species. 372 00:32:20,560 --> 00:32:24,360 We reached these remote islands, thanks to a technology that, 373 00:32:24,360 --> 00:32:29,000 as far as we can tell, we are the only humans to master. 374 00:32:32,480 --> 00:32:34,680 This is a tuna fish bone. 375 00:32:34,680 --> 00:32:36,840 This particular one happens to be quite fresh. 376 00:32:36,840 --> 00:32:38,600 It's a few days old. 377 00:32:38,600 --> 00:32:42,960 But we have actually found tuna fish bones on an archaeological site 378 00:32:42,960 --> 00:32:48,200 on these islands that dates back to over 40,000 years. 379 00:32:48,200 --> 00:32:55,600 But tuna swim in open waters, and that means that our ancestors, 380 00:32:55,600 --> 00:32:59,640 over 40,000 years ago, they were fashioning some kind of vessel, 381 00:32:59,640 --> 00:33:02,440 and going out into the open waters, 382 00:33:02,440 --> 00:33:05,920 and coming back again, and again, and again. 383 00:33:08,040 --> 00:33:10,680 We can't be sure what form these vessels took, 384 00:33:10,680 --> 00:33:13,000 since no evidence survives, 385 00:33:13,000 --> 00:33:17,640 but they were probably simple rafts made from available wood. 386 00:33:21,120 --> 00:33:23,640 And they did more than just help us fish. 387 00:33:27,440 --> 00:33:29,800 There is a very interesting archaeological site 388 00:33:29,800 --> 00:33:33,040 on one of the neighbouring islands that has this one layer 389 00:33:33,040 --> 00:33:36,880 that is just filled with artefacts belonging to Homo sapiens. 390 00:33:36,880 --> 00:33:39,720 But the layer just before it, 391 00:33:39,720 --> 00:33:44,600 immediately preceding it, is empty and barren of those same artefacts. 392 00:33:44,600 --> 00:33:47,880 So it almost suggests that our ancestors just kind of turned up 393 00:33:47,880 --> 00:33:52,880 overnight and spread rapidly through these islands in large numbers, 394 00:33:52,880 --> 00:33:56,160 just because of the sheer volume of artefacts within that layer. 395 00:33:57,680 --> 00:34:00,160 And none of that would really be possible 396 00:34:00,160 --> 00:34:03,440 unless you were skilled enough to build robust craft, 397 00:34:03,440 --> 00:34:07,080 you were skilled enough to navigate treacherous waters. 398 00:34:11,640 --> 00:34:17,560 But in a truly surprising twist, we were not the first to reach Flores. 399 00:34:19,320 --> 00:34:22,200 Somehow, someone made it here before us. 400 00:34:27,680 --> 00:34:31,280 Sometimes in this job, you get to fulfil a lifelong dream, 401 00:34:31,280 --> 00:34:33,760 and one of them is about to happen. 402 00:34:33,760 --> 00:34:36,880 See, there's this cave in palaeoanthropology that isn't 403 00:34:36,880 --> 00:34:40,280 just fascinating, it's basically explosive. 404 00:34:40,280 --> 00:34:41,880 It started in 1950, 405 00:34:41,880 --> 00:34:45,880 with this one priest called Father Theodor Verhoeven. 406 00:34:45,880 --> 00:34:48,080 Now, back in the day, it was actually quite common 407 00:34:48,080 --> 00:34:51,240 for priests and missionaries to also dabble in archaeology, 408 00:34:51,240 --> 00:34:54,720 so he was out here on Flores looking for archaeological sites. 409 00:34:54,720 --> 00:34:56,320 And in talking to locals, 410 00:34:56,320 --> 00:34:59,480 he got told about this one cave that had potential. 411 00:34:59,480 --> 00:35:03,480 He turned up, it was actually being used as an amateur school, 412 00:35:03,480 --> 00:35:09,160 but just below the surface, he did actually find archaeology. 413 00:35:09,160 --> 00:35:13,960 Actually, it was stone tools belonging to ancient humans. 414 00:35:13,960 --> 00:35:17,920 Now, that in of itself is huge, it's really significant, 415 00:35:17,920 --> 00:35:21,840 but it would take another half a century before we understood 416 00:35:21,840 --> 00:35:24,840 just how important this cave was. 417 00:35:40,760 --> 00:35:43,680 For over 20 years, a joint Indonesian and international 418 00:35:43,680 --> 00:35:47,680 team of archaeologists has been excavating these caves. 419 00:35:49,080 --> 00:35:51,640 They had been searching for evidence of the spread 420 00:35:51,640 --> 00:35:53,760 of Homo sapiens through the islands. 421 00:35:55,600 --> 00:35:58,440 Instead, they found something completely unexpected... 422 00:36:00,400 --> 00:36:05,000 ..a strange skeleton from at least 70,000 years ago. 423 00:36:05,000 --> 00:36:09,560 So long before our species reached this far from Africa. 424 00:36:12,120 --> 00:36:14,440 I think the first thing obviously that strikes you 425 00:36:14,440 --> 00:36:17,280 when you see her is that she's very short. 426 00:36:18,920 --> 00:36:20,800 Um, what are we talking, one metre? 427 00:36:25,880 --> 00:36:28,960 - Right, so about three and a half feet? - Yeah. 428 00:36:47,040 --> 00:36:49,080 - It's got wisdom teeth. - Yes. 429 00:36:51,120 --> 00:36:53,720 Yeah. I mean, the molars are... The adult molars are there. 430 00:36:55,040 --> 00:36:56,240 Yeah, yeah, yeah. 431 00:36:56,240 --> 00:36:59,280 As soon as you look closely, this is 100% an adult. 432 00:36:59,280 --> 00:37:00,640 Yeah. Yeah. 433 00:37:03,760 --> 00:37:07,440 An adult, but the size of a child. 434 00:37:07,440 --> 00:37:09,480 And that was only the first surprise. 435 00:37:12,520 --> 00:37:14,960 - The legs, they're quite short. - Yeah. 436 00:37:21,160 --> 00:37:22,200 Whereas, with us... 437 00:37:23,840 --> 00:37:26,080 Our legs are really long... 438 00:37:26,080 --> 00:37:27,800 ..compared to arms. 439 00:37:27,800 --> 00:37:28,840 Yeah. 440 00:37:30,440 --> 00:37:31,800 Yup. 441 00:37:36,400 --> 00:37:38,200 - Which is huge... - Is huge, yes. 442 00:37:38,200 --> 00:37:40,720 ..because on me that would be about that length. 443 00:37:57,840 --> 00:38:00,600 I mean, this is one of those moments in the history of the field 444 00:38:00,600 --> 00:38:03,400 where I just wish I had been there. 445 00:38:03,400 --> 00:38:06,360 I know she's a replica, but she's a replica of the real thing, 446 00:38:06,360 --> 00:38:10,000 and, yeah, it's... 447 00:38:10,000 --> 00:38:11,360 It's giving me goose bumps. 448 00:38:18,760 --> 00:38:21,640 This new species of human was a revelation. 449 00:38:23,440 --> 00:38:26,360 Named Homo floresiensis, after the island, 450 00:38:26,360 --> 00:38:30,360 they quickly became known to many as "the hobbits," after the 451 00:38:30,360 --> 00:38:36,600 heroes from the Lord of the Rings, who were also small as adults. 452 00:38:41,120 --> 00:38:44,760 It's likely they arrived entirely by chance. Perhaps a few 453 00:38:44,760 --> 00:38:49,880 individuals swept here on driftwood from the islands to the north... 454 00:38:52,160 --> 00:38:54,480 ..more than 700,000 years ago. 455 00:38:59,520 --> 00:39:02,040 Eventually becoming a unique species, 456 00:39:02,040 --> 00:39:07,480 seemingly with a mix of modern and more ancient characteristics. 457 00:39:10,240 --> 00:39:13,240 Now, we can see obviously the brain is small, 458 00:39:13,240 --> 00:39:15,200 but how small are we talking? 459 00:39:23,120 --> 00:39:25,880 - That... - That's right. - How incredible. 460 00:39:29,200 --> 00:39:32,920 Such a small brain, and yet they had stone tools. 461 00:39:37,040 --> 00:39:42,160 Before this, scientists assumed that a human with such a small brain 462 00:39:42,160 --> 00:39:44,280 could never have developed such tools. 463 00:39:46,480 --> 00:39:49,400 One theory is that they were initially a much larger 464 00:39:49,400 --> 00:39:52,720 species, before the long isolation on Flores caused them 465 00:39:52,720 --> 00:39:57,960 to shrink, a process known as island dwarfism, 466 00:39:57,960 --> 00:40:02,680 where large animals get smaller due to fewer resources. 467 00:40:02,680 --> 00:40:08,560 At the same time, some small animals actually get bigger, 468 00:40:08,560 --> 00:40:10,520 due to a lack of predators. 469 00:40:28,720 --> 00:40:31,800 So Stegodons generally are not the size of water buffaloes. 470 00:40:33,280 --> 00:40:34,760 - Exactly, yeah. - But on this island... 471 00:40:34,760 --> 00:40:36,880 - It's big one. - ..they're the size of a water buffalo. - Yeah. 472 00:40:36,880 --> 00:40:39,440 And then on this island, you've got humans that are a metre tall. 473 00:40:39,440 --> 00:40:40,880 Yeah, that small. 474 00:40:40,880 --> 00:40:45,120 What you're describing there is a species that has been 475 00:40:45,120 --> 00:40:46,800 shaped by this island, has been 476 00:40:46,800 --> 00:40:51,560 shaped by the environment on this island, and the result is this. 477 00:40:55,600 --> 00:40:59,920 Long isolation allowed evolution to tailor the hobbit 478 00:40:59,920 --> 00:41:01,160 to this environment. 479 00:41:05,240 --> 00:41:07,840 Their long arms, compared to short legs, 480 00:41:07,840 --> 00:41:11,000 a response to perhaps the steep terrain, 481 00:41:11,000 --> 00:41:14,560 or the lack of predators on the island to run away from. 482 00:41:17,240 --> 00:41:21,480 Physical adaptations that, along with those simple stone tools, 483 00:41:21,480 --> 00:41:25,680 helped them survive here for hundreds of thousands of years. 484 00:41:35,760 --> 00:41:38,400 - You can see, it's like layers of cake. - Yes. 485 00:41:38,400 --> 00:41:40,400 So every period has left a layer. 486 00:41:41,680 --> 00:41:44,560 So this is like a snapshot in time, telling us 487 00:41:44,560 --> 00:41:47,000 a lot about different periods. 488 00:41:55,680 --> 00:41:58,120 That's basically flow from volcanic eruption? 489 00:41:58,120 --> 00:41:59,160 Yeah. 490 00:42:11,080 --> 00:42:12,200 Mm-hm. 491 00:42:17,440 --> 00:42:18,600 Right. 492 00:42:30,560 --> 00:42:32,040 Right. 493 00:42:37,960 --> 00:42:39,160 So Homo sapiens. 494 00:42:49,480 --> 00:42:50,760 That's really significant. 495 00:42:50,760 --> 00:42:53,040 So the pyroclastic flow is when you have the gas 496 00:42:53,040 --> 00:42:55,200 and material that comes from a volcanic eruption, 497 00:42:55,200 --> 00:42:57,520 and really, I mean, that would just be quite destructive. 498 00:42:57,520 --> 00:42:58,760 Yeah. 499 00:43:12,680 --> 00:43:16,160 We don't think that that final eruption alone caused 500 00:43:16,160 --> 00:43:18,240 the extinction of the hobbits. 501 00:43:18,240 --> 00:43:21,640 It would have been a catastrophic event here at the cave, 502 00:43:21,640 --> 00:43:25,000 but we don't know how it affected the rest of the island. 503 00:43:27,080 --> 00:43:30,480 What we do know is that this shows the time of the hobbits here 504 00:43:30,480 --> 00:43:32,800 was coming to an end. 505 00:43:35,960 --> 00:43:38,840 So you're looking at actually quite a different world down there, 506 00:43:38,840 --> 00:43:40,960 - to up there. Yeah. - Exactly, yes, exactly. 507 00:43:56,920 --> 00:44:00,440 This tiny island has been home to two species of human. 508 00:44:07,440 --> 00:44:09,040 One remains to this day. 509 00:44:10,400 --> 00:44:11,960 One vanished long ago. 510 00:44:25,920 --> 00:44:30,640 It is wonderful to imagine what this place was like before all of this. 511 00:44:32,800 --> 00:44:36,880 Thousands of years before our ancestors, you had these 512 00:44:36,880 --> 00:44:41,640 miniature elephant-like creatures who wandered open grasslands. 513 00:44:41,640 --> 00:44:47,160 You had actual dragons, the Komodo dragons, who still exist. 514 00:44:47,160 --> 00:44:52,680 And then giant marabou storks - storks that were carnivorous, 515 00:44:52,680 --> 00:44:55,920 that were my height or taller, and could fly. 516 00:44:55,920 --> 00:44:58,080 It was like a fantasy island. 517 00:44:58,080 --> 00:44:59,560 And amongst all of it, 518 00:44:59,560 --> 00:45:04,840 there were these humans who were tiny, who came up to about my hip. 519 00:45:07,640 --> 00:45:10,960 And those hobbits lived here on this island for a staggering 520 00:45:10,960 --> 00:45:16,760 length of time, potentially for more than 700,000 years, 521 00:45:16,760 --> 00:45:20,240 longer than we've existed as a species. 522 00:45:22,840 --> 00:45:26,160 And yet, there is this twist, because so far, 523 00:45:26,160 --> 00:45:30,200 we have found no evidence of them past these shores. 524 00:45:30,200 --> 00:45:35,000 Their whole story plays out only on this island of Flores. 525 00:45:39,480 --> 00:45:42,760 Our own species, in just a fraction of that time, 526 00:45:42,760 --> 00:45:47,480 was able to spread across a huge portion of the globe. 527 00:45:57,480 --> 00:46:02,160 Around 50,000 years ago, the climate here became warmer and drier, 528 00:46:02,160 --> 00:46:04,320 changing the environment. 529 00:46:06,960 --> 00:46:11,760 At the same time, those violent volcanic eruptions also struck. 530 00:46:21,360 --> 00:46:25,280 Whatever the reason, it meant that Homo floresiensis faced not 531 00:46:25,280 --> 00:46:28,600 just change, but rapid change. 532 00:46:28,600 --> 00:46:32,240 That meant that their physiology, their physical adaptations, 533 00:46:32,240 --> 00:46:36,960 that for so long had been a benefit, were now a trap. 534 00:46:36,960 --> 00:46:40,400 They were being left behind, because it's actually incredibly 535 00:46:40,400 --> 00:46:45,560 difficult to rapidly evolve your way out of a sudden crisis. 536 00:46:45,560 --> 00:46:49,840 And they couldn't behaviourally adapt to this change either. 537 00:46:49,840 --> 00:46:53,120 Nor could they, say, escape and move to another island. 538 00:46:53,120 --> 00:46:58,800 And so these wonderful, fantastic relatives of ours vanished forever. 539 00:46:59,800 --> 00:47:03,920 And in their place, Homo sapiens appeared, making this island, 540 00:47:03,920 --> 00:47:06,840 like so many places, their home. 541 00:47:15,880 --> 00:47:20,640 So far, we've found no evidence that our two species overlapped. 542 00:47:27,320 --> 00:47:32,240 But for many, the final factor in the hobbit's extinction 543 00:47:32,240 --> 00:47:34,200 is likely our sudden arrival. 544 00:47:39,480 --> 00:47:41,360 The hobbit simply couldn't compete 545 00:47:41,360 --> 00:47:43,600 with this highly adaptable newcomer... 546 00:47:46,440 --> 00:47:49,400 ..a species able to change its behaviour 547 00:47:49,400 --> 00:47:52,640 to suit almost any environment and condition. 548 00:47:56,520 --> 00:48:01,400 The very characteristics driving our continuing spread across the globe. 549 00:48:10,600 --> 00:48:13,400 As we spread further and further away from Africa, 550 00:48:13,400 --> 00:48:15,240 entering into brand-new environments 551 00:48:15,240 --> 00:48:18,600 that we had never experienced before, 552 00:48:18,600 --> 00:48:22,680 we're not just surviving in these places, 553 00:48:22,680 --> 00:48:26,000 we're actually setting down roots. 554 00:48:26,000 --> 00:48:29,040 And roots that would last us till this very day. 555 00:48:36,440 --> 00:48:39,000 There was one last part of this journey to go. 556 00:48:46,320 --> 00:48:51,360 We set out on a path no other human species had travelled... 557 00:48:54,360 --> 00:48:56,520 ..perhaps following tantalising hints 558 00:48:56,520 --> 00:48:58,480 that there was more land to explore. 559 00:49:02,080 --> 00:49:07,440 Clouds on the horizon, returning flights of birds... 560 00:49:09,080 --> 00:49:13,880 ..or maybe something much more instinctive that inspired, 561 00:49:13,880 --> 00:49:21,320 we think, dozens of families to strike out on a voyage that 562 00:49:21,320 --> 00:49:23,280 would carry them to a new continent... 563 00:49:26,040 --> 00:49:27,160 ..Australia. 564 00:49:33,960 --> 00:49:36,600 Now, these were people who were comfortable on the water, 565 00:49:36,600 --> 00:49:39,080 they were going from island to island, 566 00:49:39,080 --> 00:49:42,000 but Australia was something different. 567 00:49:42,000 --> 00:49:45,800 We're talking about a journey that was up to 100km, 568 00:49:45,800 --> 00:49:48,400 60 miles. 569 00:49:48,400 --> 00:49:51,800 That's days and nights on the open ocean, 570 00:49:51,800 --> 00:49:57,040 probably in something as basic as a raft that was perhaps being 571 00:49:57,040 --> 00:50:00,080 propelled and steered with just paddles. 572 00:50:02,800 --> 00:50:08,680 Launching out into that hostile and expansive ocean, 573 00:50:08,680 --> 00:50:13,760 that would be an expedition today, let alone back then. 574 00:50:16,240 --> 00:50:18,680 When I think about the risk involved, 575 00:50:18,680 --> 00:50:24,960 when I think about the emptiness, it is just absolutely astonishing. 576 00:50:41,760 --> 00:50:44,920 The islands of Indonesia were another waypoint 577 00:50:44,920 --> 00:50:46,320 in our ongoing journey. 578 00:50:51,880 --> 00:50:56,520 Our unique adaptability that helped us cross the harsh deserts... 579 00:50:58,160 --> 00:51:00,760 ..and break through the barrier of the rainforest... 580 00:51:05,560 --> 00:51:09,440 ..now carried us practically to the ends of the Earth. 581 00:51:11,360 --> 00:51:16,520 To Australia, around 9,000 miles from where we began. 582 00:51:19,400 --> 00:51:22,760 Which does beg the question, what kept driving us on... 583 00:51:24,720 --> 00:51:28,920 ..ultimately inspiring us to take on the dangers of the open ocean? 584 00:51:32,680 --> 00:51:35,800 It's true that there will often have been a push. 585 00:51:36,920 --> 00:51:39,680 The simple need to find new resources 586 00:51:39,680 --> 00:51:42,080 for our expanding population. 587 00:51:45,240 --> 00:51:49,160 But I would argue that that is not the full explanation, 588 00:51:49,160 --> 00:51:52,560 that this is the most intangible part of the story. 589 00:51:52,560 --> 00:51:56,040 See, these people, in my opinion, were just like us, 590 00:51:56,040 --> 00:51:59,080 so they had the same fears and hopes for their families. 591 00:52:01,760 --> 00:52:03,720 We are clearly the explorer species. 592 00:52:03,720 --> 00:52:05,760 I think that is beyond a doubt. 593 00:52:07,760 --> 00:52:09,400 And, as a result, 594 00:52:09,400 --> 00:52:13,720 we have been able to take on things that seem absolutely impossible. 595 00:52:16,040 --> 00:52:19,240 In that desire to understand what was out there, 596 00:52:19,240 --> 00:52:22,720 in the thrill and excitement of understanding the unknown, 597 00:52:22,720 --> 00:52:26,560 and the willingness to take risk to know it. 598 00:52:26,560 --> 00:52:29,640 See, wanderlust, creativity 599 00:52:29,640 --> 00:52:34,120 and the imagination required to put yourself in a different place, 600 00:52:34,120 --> 00:52:40,560 into a different future and world, I think that is fundamentally us. 601 00:53:14,640 --> 00:53:20,840 We chart the spread of Homo sapiens into the expanses of Europe 602 00:53:20,840 --> 00:53:26,880 as our species struggles to survive in the grip of a cruel Ice Age 603 00:53:26,880 --> 00:53:32,760 and comes face-to-face with another sophisticated species of human... 604 00:53:34,640 --> 00:53:39,360 ..the Neanderthals, who had long mastered life in these cold lands. 605 00:53:51,640 --> 00:53:55,640 In this episode, we filmed at a place I've long dreamt of visiting, 606 00:53:55,640 --> 00:53:59,840 one of the most important human archaeological sites of all, 607 00:53:59,840 --> 00:54:01,280 Liang Bua cave... 608 00:54:03,000 --> 00:54:05,960 ..where scientists are still trying to solve the many mysteries 609 00:54:05,960 --> 00:54:09,840 surrounding the hobbits, the ancient humans that lived here. 610 00:54:11,520 --> 00:54:14,440 In 2004, their discovery sent shock waves through 611 00:54:14,440 --> 00:54:16,080 the scientific community. 612 00:54:18,640 --> 00:54:22,560 So, the moment the paper's dropped, it was massive. 613 00:54:24,880 --> 00:54:26,120 It was all over the news. 614 00:54:26,120 --> 00:54:27,760 It was all over the internet. 615 00:54:27,760 --> 00:54:29,520 Everyone was talking about this tiny, 616 00:54:29,520 --> 00:54:31,360 unexpected hobbit from Indonesia. 617 00:54:33,680 --> 00:54:37,080 Paige has known Thomas and the team since 2017, 618 00:54:37,080 --> 00:54:38,840 documenting their research. 619 00:54:40,440 --> 00:54:42,680 Like many scientific breakthroughs, 620 00:54:42,680 --> 00:54:46,240 the initial discovery created intense controversy. 621 00:54:48,200 --> 00:54:50,320 The conferences got extremely heated. 622 00:54:50,320 --> 00:54:53,840 Sometimes there would be hobbit sessions where within the same 623 00:54:53,840 --> 00:54:57,480 session, you would have a few talks would be sort of pro hobbit - 624 00:54:57,480 --> 00:55:00,640 so, "This is a new species, this is really exciting, 625 00:55:00,640 --> 00:55:02,600 this is changing a lot of what we thought we knew 626 00:55:02,600 --> 00:55:03,760 about human evolution" - 627 00:55:03,760 --> 00:55:05,040 and then in the same session, 628 00:55:05,040 --> 00:55:06,600 you would have people that are saying, 629 00:55:06,600 --> 00:55:08,160 "This is the biggest mistake 630 00:55:08,160 --> 00:55:10,800 "that human evolution scientists have ever made." 631 00:55:13,360 --> 00:55:16,600 Many argued that this was not a new species, 632 00:55:16,600 --> 00:55:21,760 but a Homo sapiens suffering from an illness that caused its small 633 00:55:21,760 --> 00:55:23,800 physical features and brain size. 634 00:55:25,280 --> 00:55:30,680 Eventually that was discounted, and Homo floresiensis was recognised 635 00:55:30,680 --> 00:55:37,000 as a new species of human - raising, if anything, even more questions. 636 00:55:38,560 --> 00:55:40,640 We still don't know, for example, 637 00:55:40,640 --> 00:55:43,520 where they came from or who they're closely related to. 638 00:55:43,520 --> 00:55:47,080 So that question of the origins of Homo floresiensis is still, 639 00:55:47,080 --> 00:55:50,560 I would say, almost completely an open one. 640 00:55:54,000 --> 00:55:56,680 It's possible they evolved from another ancient 641 00:55:56,680 --> 00:56:00,680 species of human, such as Homo erectus, 642 00:56:00,680 --> 00:56:04,080 which we know was in the area just over a million years ago. 643 00:56:05,720 --> 00:56:07,960 Perhaps carried to the island by chance, 644 00:56:07,960 --> 00:56:11,480 and then shrunk down over many years of isolation. 645 00:56:14,360 --> 00:56:17,600 But there is an even more controversial idea. 646 00:56:19,640 --> 00:56:22,120 If you look really hard at a lot of the characteristics, 647 00:56:22,120 --> 00:56:23,920 particularly below the cranium... 648 00:56:26,080 --> 00:56:28,320 ..you see that this is a creature 649 00:56:28,320 --> 00:56:31,760 that looks a lot more like some of our really ancient ancestors, 650 00:56:31,760 --> 00:56:34,360 more than two million years old, in Africa. 651 00:56:36,480 --> 00:56:39,840 And so maybe there was an exodus out of Africa a million years 652 00:56:39,840 --> 00:56:41,720 before we thought there was. 653 00:56:44,160 --> 00:56:46,280 This current dig might reveal the answer. 654 00:56:47,640 --> 00:56:50,640 With help from the Max Planck Institute in Germany, 655 00:56:50,640 --> 00:56:54,600 researchers are trying to collect fragments of hobbit DNA. 656 00:56:56,240 --> 00:56:59,600 Ancient DNA is really helpful at really laying out 657 00:56:59,600 --> 00:57:04,040 relationships for us between different species across time. 658 00:57:04,040 --> 00:57:07,840 And so, because of the way that mutations accumulate over time, 659 00:57:07,840 --> 00:57:10,400 it allows us to kind of work backwards 660 00:57:10,400 --> 00:57:13,680 and trace back when some of those lineages would have split. 661 00:57:14,920 --> 00:57:18,040 Homo floresiensis, and whoever their closest ancestor is, 662 00:57:18,040 --> 00:57:20,840 which is not a question we can answer until we kind of 663 00:57:20,840 --> 00:57:22,440 have some of that information. 664 00:57:24,480 --> 00:57:29,800 The problem is successfully finding hobbit DNA will not be easy. 665 00:57:31,600 --> 00:57:36,240 Normally it would be impossible to recover DNA from a situation 666 00:57:36,240 --> 00:57:38,160 where it's this hot. 667 00:57:38,160 --> 00:57:39,440 It's just too difficult. 668 00:57:40,800 --> 00:57:43,520 DNA degrades really rapidly, and other things move in 669 00:57:43,520 --> 00:57:46,560 and muddy up the signal, like bacteria and other things. 670 00:57:47,840 --> 00:57:49,520 But in this cave in particular, 671 00:57:49,520 --> 00:57:53,880 it is at a slightly higher altitude than a lot of Indonesia is, 672 00:57:53,880 --> 00:57:55,480 it's right up in the mountains, 673 00:57:55,480 --> 00:57:59,240 and so it is a little bit cooler than most equatorial areas. 674 00:57:59,240 --> 00:58:02,600 And so there is a little bit of hope that we might be able to 675 00:58:02,600 --> 00:58:04,920 get a little bit of a signal from the species. 676 00:58:07,400 --> 00:58:11,800 If successful, we might finally solve the mystery of the hobbit. 677 00:58:13,360 --> 00:58:16,880 Whatever happens, Homo floresiensis will remain one of the most 678 00:58:16,880 --> 00:58:22,960 important and unexpected discoveries of recent history. 56825

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