1 00:00:06,216 --> 00:00:08,885 [ Man Narrating ] The strange circle at Stonehenge. 2 00:00:11,554 --> 00:00:13,556 A towering Mayan pyramid. 3 00:00:15,266 --> 00:00:17,435 The obelisks of ancient Egypt. 4 00:00:19,604 --> 00:00:21,356 Massive stone monuments... 5 00:00:22,232 --> 00:00:24,693 the conceal a mysterious ancient code... 6 00:00:26,945 --> 00:00:29,572 linked by the big history... 7 00:00:29,656 --> 00:00:31,658 of the sun. 8 00:00:33,451 --> 00:00:36,121 We think of history as a timeline... 9 00:00:36,204 --> 00:00:40,667 a series of events stretching a few thousand years into the past. 10 00:00:40,750 --> 00:00:43,253 It's time to think bigger. 11 00:00:43,336 --> 00:00:47,799 Instead of a line, imagine a web of infinite connections... 12 00:00:47,882 --> 00:00:50,385 interacting over billions of years... 13 00:00:50,468 --> 00:00:54,139 linked together to create everything we've ever known- 14 00:00:54,222 --> 00:00:56,891 our universe, our planet... 15 00:00:56,975 --> 00:00:58,017 and us. 16 00:00:58,101 --> 00:01:02,188 History as we know it is about to get big. 17 00:01:08,445 --> 00:01:10,363 [ Narrator] Across the ancient world... 18 00:01:10,447 --> 00:01:14,075 massive monuments rise in perfect alignment... 19 00:01:14,159 --> 00:01:18,079 so that in the right place, at the right moment... 20 00:01:19,289 --> 00:01:21,541 the people can behold a god- 21 00:01:22,584 --> 00:01:24,085 the sun. 22 00:01:28,298 --> 00:01:32,385 Traditional history tells us that sun worship is an ancient superstition... 23 00:01:33,553 --> 00:01:37,348 but big history reveals there's truth behind the myths... 24 00:01:39,184 --> 00:01:42,395 that the sun is a creator... 25 00:01:43,104 --> 00:01:46,524 a master of reality and time. 26 00:01:46,608 --> 00:01:48,526 [ Clock Ticking ] 27 00:01:50,695 --> 00:01:53,198 [ Man ] The way we view time is shaped... 28 00:01:53,281 --> 00:01:56,409 by the fact that we grew up on this planet... 29 00:01:57,744 --> 00:01:59,496 with this sun... 30 00:01:59,579 --> 00:02:01,581 with this cycle. 31 00:02:01,664 --> 00:02:05,376 And it dictates so much about our bodies and our brains... 32 00:02:05,460 --> 00:02:07,295 and our social organization. 33 00:02:08,588 --> 00:02:12,383 You can't even imagine what life would be like without the sun. 34 00:02:22,185 --> 00:02:25,313 [ Narrator] Night always becomes day... 35 00:02:25,396 --> 00:02:27,899 and days become years. 36 00:02:30,235 --> 00:02:33,404 The sun sets the rules of time on Earth-.. 37 00:02:33,488 --> 00:02:36,449 Rules we must follow to survive. 38 00:02:36,533 --> 00:02:39,536 [ Markley] if your calendar is not in sync with the sun... 39 00:02:39,619 --> 00:02:42,163 it's disaster for your farmers. 40 00:02:42,247 --> 00:02:45,917 They don't know properly when to plant. They don't know when to harvest. 41 00:02:46,000 --> 00:02:49,754 If you don't get it right, you could starve. 42 00:02:57,095 --> 00:02:59,931 [ Narrator] Our early monuments aren't just temples... 43 00:03:00,932 --> 00:03:02,767 they're the first calendars. 44 00:03:03,935 --> 00:03:06,688 Big history connects... 45 00:03:13,111 --> 00:03:14,904 to southern England. 46 00:03:16,030 --> 00:03:17,782 On the first day of summer... 47 00:03:17,866 --> 00:03:20,785 the sun rises over Stonehenge... 48 00:03:20,869 --> 00:03:23,997 until I! seems to balance on one of the main stones... 49 00:03:24,080 --> 00:03:26,583 marking the longest day of the year. 50 00:03:34,799 --> 00:03:36,467 And to Mexico... 51 00:03:36,551 --> 00:03:39,971 when the sunset over the Mayan ruins at Chichén Itzé... 52 00:03:40,054 --> 00:03:43,725 creates a serpent of shadows on the central pyramid... 53 00:03:43,808 --> 00:03:46,936 to mark the first day of spring and fall. 54 00:03:55,153 --> 00:03:56,821 And to Egypt... 55 00:03:57,864 --> 00:04:01,367 where massive obelisks are giant sundials... 56 00:04:01,451 --> 00:04:05,330 that mark the hours of the day and the passage of seasons. 57 00:04:06,372 --> 00:04:09,083 [ Man ] it's pretty clear that ancient peoples... 58 00:04:09,167 --> 00:04:13,338 tracked the motions of the sun over the course of the year... 59 00:04:13,421 --> 00:04:17,008 and built their structures to some degree... 60 00:04:17,091 --> 00:04:19,677 to agree with those directions. 61 00:04:26,893 --> 00:04:30,355 [ Narrator] From monuments to calendars... 62 00:04:30,438 --> 00:04:33,942 we create tools to help us make sense of the sun. 63 00:04:35,693 --> 00:04:38,905 But big history reveals we've always had the key... 64 00:04:38,988 --> 00:04:41,407 to crack the solar code... 65 00:04:41,491 --> 00:04:43,409 hidden within us. 66 00:04:55,755 --> 00:04:59,717 You are not in control of your own body. 67 00:04:59,801 --> 00:05:01,803 The sun is your master. 68 00:05:03,554 --> 00:05:07,016 Inside nearly every one of your cells... 69 00:05:07,100 --> 00:05:11,396 tiny proteins run on a 24-hour cycle- 70 00:05:11,479 --> 00:05:13,982 a clock set to the sun... 71 00:05:14,065 --> 00:05:17,860 that tells your body what to do and when to do it. 72 00:05:18,778 --> 00:05:22,073 These clocks control every animal on earth. 73 00:05:23,992 --> 00:05:27,745 They first evolve in single-celled organisms... 74 00:05:29,414 --> 00:05:31,499 that sync themselves up with the sun... 75 00:05:31,582 --> 00:05:34,836 for the same reason ancient humans do. 76 00:05:37,505 --> 00:05:39,507 [ Man ] When you have big changes in the environment... 77 00:05:39,590 --> 00:05:41,801 and they're very predictable... 78 00:05:41,884 --> 00:05:46,431 this encourages the evolution of a timing system to follow them. 79 00:05:47,432 --> 00:05:50,143 [ Man ] When you think about this cycle of day to night... 80 00:05:50,226 --> 00:05:52,353 which occurs so regularly here on our planet... 81 00:05:52,437 --> 00:05:56,190 it's the most dramatic regular change, if you like... 82 00:05:56,274 --> 00:05:58,735 that organisms at all levels had to cope with, had to deal with... 83 00:05:58,818 --> 00:06:00,653 had to adjust to in different ways. 84 00:06:05,908 --> 00:06:10,538 So we see that during the evolution of the earliest cells... 85 00:06:10,621 --> 00:06:13,916 this change was recognized as being so significant... 86 00:06:14,000 --> 00:06:17,045 for all the activities that cells needed to undertake... 87 00:06:17,128 --> 00:06:21,424 that it was encoded even from the very beginning of cellular activity... 88 00:06:21,507 --> 00:06:23,676 into the very D.N.A. of cells. 89 00:06:34,395 --> 00:06:37,065 [ Narrator] The human body has trillions of cells... 90 00:06:37,148 --> 00:06:40,151 so there are trillions of individual clocks... 91 00:06:40,234 --> 00:06:43,488 and one master clock that rules them all. 92 00:06:43,571 --> 00:06:45,031 [Ticking ] 93 00:06:45,114 --> 00:06:47,825 A small structure in the brain... 94 00:06:47,909 --> 00:06:51,412 that controls the body's coordinated timing system... 95 00:06:51,496 --> 00:06:53,664 the circadian rhythm. 96 00:06:53,748 --> 00:06:56,459 It works independently of our thoughts... 97 00:06:56,542 --> 00:06:59,629 and can even run outside of our bodies. 98 00:06:59,712 --> 00:07:03,549 It's possible to take the central clock out of an animal, put it in a dish... 99 00:07:03,633 --> 00:07:07,678 and these cells will keep track of time, keep running for years. 100 00:07:11,224 --> 00:07:15,144 [ Narrator] The big history perspective reveals a profound pattern. 101 00:07:16,437 --> 00:07:19,273 Just as civilizations build megastructures... 102 00:07:19,357 --> 00:07:21,567 to track the movement of the sun... 103 00:07:21,651 --> 00:07:24,487 to know the best times to plant and harvest... 104 00:07:24,987 --> 00:07:28,950 the body's microstructures do the same thing from the inside... 105 00:07:29,033 --> 00:07:33,704 telling us when to work, to eat, to sleep. 106 00:07:35,373 --> 00:07:39,961 Circadian rhythms fine-tune our bodies to the time of day... 107 00:07:40,044 --> 00:07:43,589 speeding up metabolism before sunrise to give us energy... 108 00:07:44,423 --> 00:07:46,551 and preparing us for sleep at night... 109 00:07:46,634 --> 00:07:51,389 by lowering blood pressure and slowing down the activity in our brain. 110 00:07:53,391 --> 00:07:56,435 The system has such powerful control over us... 111 00:07:56,519 --> 00:07:59,772 it works even when we're not exposed to sunlight. 112 00:08:00,731 --> 00:08:03,693 Miners trapped underground for weeks... 113 00:08:03,776 --> 00:08:07,113 still wake and sleep on a 24-hour cycle. 114 00:08:09,031 --> 00:08:13,995 This is such a powerful regulator of our body's physiology and cell biology... 115 00:08:14,078 --> 00:08:18,457 that the individual cells will continue to follow a near 24-hour oscillation... 116 00:08:18,541 --> 00:08:20,501 even without any sunlight at all... 117 00:08:20,585 --> 00:08:23,337 because it's part of our biology, part of our D.N.A... 118 00:08:23,421 --> 00:08:25,798 is to have this timing system... 119 00:08:25,882 --> 00:08:28,551 where everything in our body is designed to follow the sun. 120 00:08:36,100 --> 00:08:38,186 [ Narrator] From our cells... 121 00:08:38,269 --> 00:08:40,438 to our bodies... 122 00:08:40,521 --> 00:08:42,648 to our civilizations... 123 00:08:42,732 --> 00:08:46,319 the sun shapes how we perceive time. 124 00:08:46,402 --> 00:08:48,863 But big history reveals... 125 00:08:48,946 --> 00:08:52,241 the sun also defines what we believe is real... 126 00:08:53,951 --> 00:08:56,621 and what lies in the shadow world... 127 00:08:56,704 --> 00:08:59,874 just beyond the realm of our perception. 128 00:09:00,875 --> 00:09:02,460 - [Creature Growls] - [ Man Groans] 129 00:09:05,129 --> 00:09:08,799 [ Narrator] Big history is a new way to see the world. 130 00:09:10,426 --> 00:09:13,763 It reveals that civilization thrives... 131 00:09:17,892 --> 00:09:20,394 in the same way our cells do- 132 00:09:24,815 --> 00:09:27,109 by syncing up with the sun... 133 00:09:27,193 --> 00:09:30,363 the timekeeper at the center of our solar system. 134 00:09:33,824 --> 00:09:35,785 When we sync up with the sun... 135 00:09:35,868 --> 00:09:38,746 we're tracking two different kinds of time: 136 00:09:38,829 --> 00:09:42,416 a year, the time it takes Earth to orbit the sun... 137 00:09:43,709 --> 00:09:48,256 and a day, the time it takes to spin in and out of the sun's light. 138 00:09:49,632 --> 00:09:53,719 But time, as we know it, is unique to planet Earth... 139 00:09:59,850 --> 00:10:03,980 because every planet journeys around the sun in its own way. 140 00:10:10,861 --> 00:10:15,408 Venus is so close to the sun and rotates so slowly... 141 00:10:15,491 --> 00:10:18,536 that its day is longer than its year. 142 00:10:20,162 --> 00:10:22,623 Jupiter spins so fast... 143 00:10:22,707 --> 00:10:25,751 its day is less than 10 hours. 144 00:10:30,256 --> 00:10:35,052 Beyond our solar system, there are worlds that don't rotate at all. 145 00:10:35,136 --> 00:10:38,514 One side remains in permanent daylight... 146 00:10:38,597 --> 00:10:41,851 while the other is stuck in a constant fleeze of darkness. 147 00:10:43,311 --> 00:10:46,147 It's hard to imagine life on Earth... 148 00:10:46,230 --> 00:10:50,443 without the 24-hour pattern of sunrise and sunset... 149 00:10:50,526 --> 00:10:52,820 sweeping across the globe. 150 00:10:56,490 --> 00:11:01,412 Big history reveals that even from 93 million miles away... 151 00:11:01,495 --> 00:11:04,915 the sun has the power to control our lives. 152 00:11:06,751 --> 00:11:10,421 It shapes our perception of what is real.. 153 00:11:10,921 --> 00:11:13,090 What we see... 154 00:11:13,174 --> 00:11:15,176 and what we can't. 155 00:11:22,433 --> 00:11:25,353 Our eyes are designed to do one thing- 156 00:11:25,436 --> 00:11:28,064 make sense of sunlight. 157 00:11:28,147 --> 00:11:33,652 The light we see is less than half of what the sun beams to us. 158 00:11:35,821 --> 00:11:37,823 It's all part of a spectrum... 159 00:11:37,907 --> 00:11:40,576 made up of different wavelengths of light. 160 00:11:40,659 --> 00:11:43,996 Humans can only see light in the middle of the spectrum. 161 00:11:44,080 --> 00:11:48,376 Our eyes can't perceive light waves that are too long or too short- 162 00:11:48,459 --> 00:11:51,128 the infrared and the ultraviolet. 163 00:11:51,212 --> 00:11:53,547 It's a world that's invisible to us... 164 00:11:53,631 --> 00:11:56,801 but not to every animal. 165 00:11:56,884 --> 00:12:00,221 - Some hawks can see ultra violet' light. - [ Shrieks ] 166 00:12:00,304 --> 00:12:03,849 An adaptation that allows them to track prey from above... 167 00:12:04,642 --> 00:12:08,854 as the light bounces off urine that rodents use to mark their trails. 168 00:12:17,071 --> 00:12:20,408 Pit vipers evolved special organs to sense heat... 169 00:12:22,493 --> 00:12:24,703 so they can track their prey with infrared light... 170 00:12:24,787 --> 00:12:27,039 that we could never see. 171 00:12:34,839 --> 00:12:38,008 If we could see it all, we'd be oven/vhetroed. 172 00:12:40,678 --> 00:12:46,058 So our eyes evolved to pick out the parts of the sun's light we need the most. 173 00:12:46,142 --> 00:12:48,686 Most mammals see the world like this. 174 00:12:49,562 --> 00:12:52,898 Their eyes only have cells to detect two colors- 175 00:12:52,982 --> 00:12:55,443 blues and greens. 176 00:12:55,526 --> 00:12:59,655 But humans have a third type of cell for detecting reds. 177 00:12:59,738 --> 00:13:01,574 Soto us... 178 00:13:01,657 --> 00:13:04,160 the same scene looks like this. 179 00:13:14,545 --> 00:13:17,882 Why can we see colors that other animals can't? 180 00:13:21,260 --> 00:13:24,513 Big history links back 20 million years. 181 00:13:32,897 --> 00:13:35,232 It starts with our early ancestors- 182 00:13:35,316 --> 00:13:37,651 primates who live in the trees... 183 00:13:37,735 --> 00:13:41,614 where the ability to see red is an advantage. 184 00:13:42,656 --> 00:13:45,493 It allows them to spot brightly colored fruit... 185 00:13:45,576 --> 00:13:48,245 against a background of green leaves. 186 00:13:49,830 --> 00:13:53,417 Humans inherit this full-color daytime vision... 187 00:13:53,501 --> 00:13:55,669 which gives us an edge. 188 00:13:55,753 --> 00:13:59,173 [ Benjamin ] Humans are exquisitely adapted for daytime activity... 189 00:13:59,256 --> 00:14:03,260 which meant that we were able to hunt so successfully... 190 00:14:03,344 --> 00:14:05,513 and eventually regulate all of our activity... 191 00:14:05,596 --> 00:14:08,724 to the sun, to this regular cycle of day and light. 192 00:14:11,477 --> 00:14:14,480 [ Narrator] But there are always trade-offs in evolution. 193 00:14:15,940 --> 00:14:19,944 Full-color vision is good for finding food in daylight... 194 00:14:21,737 --> 00:14:23,322 but eyes that see color well... 195 00:14:24,823 --> 00:14:26,575 don't see well at night. 196 00:14:28,077 --> 00:14:31,497 The color-detecting cells in our eyes turn off... 197 00:14:31,580 --> 00:14:34,792 and change our perception of reality... 198 00:14:37,378 --> 00:14:39,380 to muted shades of gray. 199 00:14:40,965 --> 00:14:45,219 Our night vision cells are 100 times more light sensitive... 200 00:14:46,428 --> 00:14:49,557 but they're simpler than the cells that perceive color. 201 00:14:53,352 --> 00:14:56,146 [ Benjamin ] The view we get of the dark is much less clear. 202 00:14:57,314 --> 00:14:59,525 It's more mysterious. 203 00:14:59,608 --> 00:15:03,320 We don't see this great spectrum of colors or anything with clarity. 204 00:15:05,155 --> 00:15:08,909 [ Narrator] This makes night a world of mystery and danger... 205 00:15:08,993 --> 00:15:13,080 where a daytime predator can suddenly fall prey... 206 00:15:13,163 --> 00:15:16,250 To a creature evolved to see in the shadow world. 207 00:15:16,333 --> 00:15:18,502 - [ Growling ] - [ Man Groans] 208 00:15:21,380 --> 00:15:24,592 [ Narrator] Big history reveals how this adaptation to the sun... 209 00:15:24,675 --> 00:15:26,594 connects to our psychology. 210 00:15:27,761 --> 00:15:30,723 For humans, light is good. 211 00:15:31,682 --> 00:15:33,434 Darkness is evil. 212 00:15:38,772 --> 00:15:41,942 In so many origin stories, we have light piercing the dark. 213 00:15:43,402 --> 00:15:46,780 And we equate that light with the divine itself. 214 00:15:47,531 --> 00:15:51,160 And we equate what we don't like and what we don't want with dark. 215 00:15:56,457 --> 00:15:59,043 And what we see there is a rise of duality. 216 00:16:00,210 --> 00:16:03,631 Once you worship the sun, you must fear the dark. 217 00:16:06,550 --> 00:16:08,469 [ Narrator] The fight between good and evil... 218 00:16:08,552 --> 00:16:12,890 Connects mankind's religions to the secrets of the sun. 219 00:16:14,391 --> 00:16:18,729 But there's an even bigger link between the sun and our beliefs. 220 00:16:19,229 --> 00:16:22,775 And it's hidden in the very moment of creation. 221 00:16:27,488 --> 00:16:31,408 [ Narrator] Big history uses science to see the world in a new way. 222 00:16:32,534 --> 00:16:35,537 It reveals that the sun controls our minds... 223 00:16:35,621 --> 00:16:37,831 from our perception of time... 224 00:16:41,877 --> 00:16:44,088 to our view of reality. 225 00:16:48,884 --> 00:16:51,553 The sun has the power to shape us. 226 00:16:57,059 --> 00:17:00,854 And while traditional history tells us that many ancient civilizations... 227 00:17:00,938 --> 00:17:02,856 believed the sun is a god... 228 00:17:02,940 --> 00:17:05,359 big history connects these ancient religions- 229 00:17:05,442 --> 00:17:06,527 [ Screams ] 230 00:17:06,610 --> 00:17:08,946 To the birth of the solar system. 231 00:17:20,958 --> 00:17:25,963 This is our cosmic neighborhood nearly five billion years ago... 232 00:17:26,046 --> 00:17:28,340 a time before the sun. 233 00:17:28,424 --> 00:17:29,633 [ Thunderclaps] 234 00:17:29,717 --> 00:17:32,886 [ Man ] if we go back before the sun came into existence... 235 00:17:32,970 --> 00:17:36,306 what we would see is sort of a vast cloud... 236 00:17:36,390 --> 00:17:38,350 of gas and dust... 237 00:17:38,434 --> 00:17:42,354 about a light-year across and containing the entire mass of the sun. 238 00:17:45,983 --> 00:17:49,486 [ Narrator] An ancient star explodes nearby. 239 00:17:50,404 --> 00:17:53,907 It unleashes a shock wave that rips through the gas cloud... 240 00:17:56,827 --> 00:17:59,496 and sends it into a tailspin. 241 00:18:01,874 --> 00:18:05,502 [ Filippenko ] That started collapsing due to its own weight. 242 00:18:05,586 --> 00:18:09,047 And it spun faster and faster as it collapsed. 243 00:18:11,258 --> 00:18:15,012 [ Narrator] Gravity pulls together a dense cluster of debris in the center. 244 00:18:16,764 --> 00:18:19,558 The remaining cloud flattens out around it. 245 00:18:24,229 --> 00:18:26,440 [ Benjamin ] So now we have a great spinning disk. 246 00:18:26,523 --> 00:18:31,612 And in this spinning disk, the sun eventually coalesces under gravity... 247 00:18:31,695 --> 00:18:35,324 reaches this incredible temperature of 10 million degrees Celsius and lights up. 248 00:18:37,367 --> 00:18:39,369 The sun lights up. 249 00:18:42,372 --> 00:18:43,749 Let there be light. 250 00:18:47,085 --> 00:18:49,087 [ Narrator] The sun is born. 251 00:18:50,380 --> 00:18:53,801 And in its wake, something else appears. 252 00:18:53,884 --> 00:18:58,639 [ Filippenko ] The sun gobbled up 99% of the matter in the cloud of gas. 253 00:18:58,722 --> 00:19:03,060 But a little bit was left over in this flat plain... 254 00:19:03,143 --> 00:19:05,729 and it coalesced into the different planets. 255 00:19:15,739 --> 00:19:17,699 [ Narrator] Planets like Earth. 256 00:19:18,700 --> 00:19:23,080 So just as the ancients believed, the sun is the creator... 257 00:19:24,414 --> 00:19:26,416 the giver of life. 258 00:19:27,501 --> 00:19:31,338 And big history reveals the way our planet is made... 259 00:19:31,421 --> 00:19:33,799 makes us who we are. 260 00:19:43,225 --> 00:19:46,186 The Earth is born in a spinning disk... 261 00:19:46,270 --> 00:19:48,730 and it never stops spinning... 262 00:19:48,814 --> 00:19:52,860 both on its axis and its orbit around the sun. 263 00:19:52,943 --> 00:19:55,821 And it's these spins that are encoded in everything- 264 00:19:56,822 --> 00:19:58,907 from our civilization... 265 00:19:59,408 --> 00:20:01,159 to ourselves. 266 00:20:03,287 --> 00:20:06,665 [ Benjamin ] These two principal spins that really affect life here on Earth- 267 00:20:06,748 --> 00:20:10,711 the great orbiting of our planet around the sun on an annual basis... 268 00:20:10,794 --> 00:20:14,214 and this 24-hour spinning cycle- 269 00:20:14,298 --> 00:20:17,593 are both embedded in the way species evolved here... 270 00:20:18,385 --> 00:20:22,806 the way we perceive of time on an annual basis, on a daily basis... 271 00:20:23,599 --> 00:20:25,679 the way we understand forces of light and darkness... 272 00:20:25,726 --> 00:20:30,230 that's influenced our psychology, our philosophy and our religion and so on. 273 00:20:31,148 --> 00:20:34,735 And these initial forces created by this vast spinning disk... 274 00:20:34,818 --> 00:20:37,321 that coalesced into a sun... 275 00:20:37,404 --> 00:20:39,781 is therefore embedded in our everyday reality. 276 00:20:44,995 --> 00:20:47,247 It's astounding how much is influenced... 277 00:20:47,331 --> 00:20:50,667 by the early creation of the solar system. 278 00:20:53,003 --> 00:20:55,380 [ Benjamin ] We are very much creatures of this planet... 279 00:20:55,464 --> 00:20:57,215 and this sun. 280 00:21:00,177 --> 00:21:02,554 [ Narrator] But the story of the sun is just the beginning. 281 00:21:02,638 --> 00:21:05,599 There's a much bigger puzzle hidden in big history. 282 00:21:05,682 --> 00:21:08,226 Each episode unlocks a clue. 283 00:21:08,310 --> 00:21:10,687 Everyday things like we fer. -. 284 00:21:11,813 --> 00:21:13,231 Silver... 285 00:21:14,316 --> 00:21:16,276 and salt... 286 00:21:16,360 --> 00:21:17,444 hold the key. 287 00:21:17,527 --> 00:21:22,115 Watch them all, and you'll see this grand mystery revealed. 288 00:21:22,199 --> 00:21:25,577 The big history of time, of space... 289 00:21:25,661 --> 00:21:28,538 the big history of us.