All language subtitles for Mythbusters.S13E05.1080p.WEB-DL.AAC2.0.H.264-NTb_track3_[eng]

What you're about to see
could be downright dangerous,

So, a word of advice...

Leave the myth busting to us.

Narrator: On this episode
of "mythbusters"...

Adam: With good reason,
we've spent 10 years

Telling you
to not try this at home.

But in this episode,
we've compiled a bunch of things

That we think you might be able
to try at home.

Like this.

Narrator:
Well, not exactly like that,

But after 200 episodes
of saying...

Don't try this at home.
Whoa.

...The myth busters
are apparently

Changing their tune...

To deliver
a diy science special.

Your results may vary.

So, prepare your
safety glasses...

Whoo-hoo-hoo-hoo!

...Your pocket protectors...

Oh!
Holy crap!

Narrator:
...And your clipboard...

Wow!

...Because for this episode,

They're finding myths
you can maybe try at home...

Or maybe not.

Who are the mythbusters?

Adam savage...
It's scientific!

Narrator:
...And jamie hyneman.

Bye-bye!

Between them, more than 30 years
of special-effects experience.

Together with kari byron...

The golden dragon!

...Tory belleci....

We're gonna die!

...And grant imahara.

Who wants some?!

Narrator:
They don't just tell the myths.

They put them to the test.

-- Captions by vitac --
www.Vitac.Com

Captions paid for by
discovery communications

Okay, so the "do try this
at home?" special.

Exactly.

Our lawyers are actually okay
with this?

They are, but here's the thrust
of this episode.

We are gonna be testing
a bunch of zany experiments

And viral videos

And assessing, one,
whether or not they're true,

But, two, whether or not they're
actually okay to try at home.

So, some of this may be
actually too dangerous to try?

Yes.

The first one,
though, I think

Is gonna be pretty easy
to try at home,

And it's a classic --
microwaved water.

Oh, yeah.

Microwaved water
will kill plants

If you water them with it.

I don't think
it's true at all,

And I think
we should test it.

It's an internet myth
that has spread worldwide.

Supposedly,
these pictures are evidence

That water boiled in a microwave
is toxic to plants,

But could that be true
or is this myth in hot water?

Well, if it turns out
you can try this at home,

You'll need the following...

And down in the shop,

Adam's green thumb is prepping
his test of the waters.

So the question
we're gonna answer is,

Does microwave-boiled water
kill plants?

Oh.

Very nice.

To determine that,
we are going to expose

Some plants to microwave
boiled water, of course.

Beautiful.

We're also gonna compare that
to some other controls.

One will be water boiled
on the stove,

One will be
just regular tap water,

One will be no water at all.

Narrator: And now for the
supposedly toxic ingredient --

The microwave-boiled water.

Obviously,
to conduct this experiment,

You're gonna need
a bunch of water

That's been boiled
in a microwave,

Bombarded by those evil
microwaves.

Put it in.

Push the button. Start.
There we go.

Run it for five minutes of
full power, see if that works.

[ ding! ]

There we go. All right.

Now, as a point of clarity
I want to point out

The myth isn't that plants
don't like boiling water.

For gosh sake, don't pour
boiling water on your plants.

You'll kill them immediately,
like most other living things.

No, let this water cool down
to room temperature

Before using it
on a living thing.

Narrator: Well, with his three
types of h2o inside the rig,

He's ready
to get his thumbs green.

Adam: There we go.

So we've used eight
romaine lettuce in four groups,

And we're subjecting
those four groups

To four distinctly different
conditions of water.

Now, that water is coming
from these buckets up here

Through these water timers,

And they're all set
to water the plants

For exactly the same amount
of time

And exactly the same amount
of water every single day.

"but wait," you say,
"what about sunlight?"

Ah, we thought of that.

Ta-da! That's the light.

These are actual grow lights.

We're gonna subject our plants
to these grow lights

For about 16 hours a day,
a really nice vibrant sunlight,

And we'll log their growth
on this chart here.

After a week, I swear
we should see a difference.

After a couple of weeks,

I think this test
is gonna be pretty definitive.

Narrator: But as exciting
as it is to watch lettuce grow,

Let's fast forward
one week into the future.

All right, let's see how
everyone's been doing.

[ laughs ]

Look at that.

9.25.

The microwave-boiled water
is outgrowing everything else.

It was around 5 1/2 inches,

And now it's
over nine inches tall.

Right now, it's not looking
very good for the myth.

Narrator: It's a drastically
different result

From those viral photos.

But why exactly
would people believe

That water boiled in
a microwave oven is dangerous?

In a word, radiation.

Microwaves are a form
of electromagnetic radiation,

But they're on the less harmful
end of the spectrum.

Microwaves work by vibrating
water molecules

Around 2.45 billion times
a second.

This vibration is then converted
to thermal energy,

And what you get is a quick
and efficient way to heat food.

But no radiation is imparted
during the process

And, theoretically,
microwave-boiled water

Is no different than water
boiled on a stove.

Still, we're gonna give it
another week

And let's see what happens.

Narrator:
So, after two weeks of growth,

Adam is let loose amongst
the lettuce for the last time.

What we wanted to determine
was whether microwave water

Was dangerous, and I think,
definitively,

We've proved that it's not.

Look at this.

This is the healthiest plant
in here.

Both of these, they're higher
than any of the others,

And they got
the microwave-boiled water.

They're totally fine.

Oh, and we also determined
that no water

Is really, really crappy
for plants,

So note that you brown thumbs.

Narrator: It may be busted,
but don't take our word for it.

Try this at home.

Next up,
some emergency firefighting.

All right, so first up
is a viral video.

The fans want to know
if it's possible

And if they can
try it at home.

Check it out.

Narrator:
With a runabout ablaze,

It's jet boat to the rescue,
fighting fire with speed.

Man:
Wow, he's doing it.

This guy's crazy.

But in a crisis,

Could an extreme 180
really extinguish a fire?

Dude, that is awesome,

But you know what?

There's something a little fishy
about that video.

It does look like
there could be

Some kind of visual effects
going on there.

We need to find out
if this thing is repeatable.

Yay, let's go boating.

Motor boating.

You old sailor, you.

Narrator:
So, to find out if this works,

Over at big break marina

They're recreating
all the elements

Of this emergency situation.

Tory: So, the boat
we're gonna be using

To put out the fire is this.

It's a 1978 charger jet boat.

It's got
a 350 oldsmobile engine.

[ horn beeping ]
come aboard, matey.

All right, safety first,
my friends. Safety first.

Not only that, but it shoots
a rooster tail up to 120 feet.

We should be able
to put out the fire with this.

I wish we had dorkier
life preservers.

Sorry, man.

These are the dorkiest ones
we could possible find.

What are you talking about?
They match the boat.

They are in this season's
color of safety.

It's hot.

Tory: And the best part is,
they're letting me drive,

Except the owner has
one stipulation.

He wants to be
on the boat with us,

Which doesn't make any sense

'cause this is probably the most
dangerous place you can be.

I think we need to practice.

See some stunt driving.
Whoo!

Narrator: Precision driving
is key to this myth,

So first tory needs
to get the boat up to speed,

Then just before he crashes
into the pylon,

Pull off that 180 turn...

...So that the boat sends up
that dousing rooster tail.

That's nice.

That was amazing practice,

But I think it's time
to light a fire.

Let's do it.

Yeah,
I think you got it, man.

Narrator: The second element
of this emergency

Is the flaming boat,

And for that,
they're taking precautions.

Grant: Oh, hay.

So, this fine water craft
is our fire boat.

We're going to set a bale of hay
and a pallet on fire

And let it burn.

Kari:
You got the air underneath

So that it can light
all of this hay

And actually get a good burn.

This thing should flame up
nicely.

Now, if things go well,

We'll be able to put it out
using the boat.

And if not, the fire department
is on hand to put it out.

Kari: It's time to set the fire,
but before we do that,

We're going to wet down
all of the lands

Right behind
where the boat's gonna be.

We don't want any stray embers
to 'cause any unnecessary fire.

Narrator: The boat is now set
to go up just like the video.

Great.
Some vacation, kari.

But will the speed boat's
rooster tail quench the blaze?

All right, boat's tied.

Tory's all ready to go.

All we got to do
is set the fire now.

Yeah, let's do this.

Tory:
Now, I'm not gonna lie.

I am a little nervous.
I mean, this isn't my boat.

All right,
proceed with lighting the fire.

We're gonna be flying
at 50 miles an hour,

Straight towards a flaming boat,

And, at the last minute,
I need to crank on the wheel

So that I don't crash
into the boat,

But spray water onto it.

All right, boys.
We have a raging fire.

Bring it on in.

And not only that,
I'm gonna have grant

And the owner of the boat
in the boat with me

So if I crash,
I'm not just hurting myself,

I'm hurting two other people.

I'm scared [bleep]less.

All right, man,
there it is.

Just try to understand
what we're doing.

We're heading straight towards
a flaming boat, right?

Exactly.
Okay.

And then, at the last minute,
we're gonna turn out.

I hope this works.

Now.

Narrator:
Later on "mythbusters"...

Kari: All right, go.
Back me up.

[ italian accent ] why can't you
get along like your brothers?

Narrator: ...More myths
you may be able to try at home.

Narrator: After 10 years
of impossible, dangerous,

And downright crazy myths
that you shouldn't...

Something just touched me!

Narrator:
...Or couldn't try at home,

This episode is all about
finding things maybe you can.

So, next, adam and jamie
get into a rhythm

With one, two, five...

216 metronomes.

Adam: [ laughing ]

Keep going, keep going.

Well, that escalated quickly,
but how did they end up here?

There are a bunch of videos
out there

That show these things
getting into sync

If you let them run for a while.

Come on, guys. Get with it.

Narrator:
It all looks so easy online.

Although they start out
syncopated,

These metronomes
eventually tick over

Into a synchronized symphony.

[ ticking ]

But can you make metronomes
dance to the same beat at home?

[ ticking ]

There is one thing
that I keep noticing

In all the videos
of the metronomes syncing up,

And it is that they always seem
to be sitting on a platform

That moves slightly, that's got
a little shake or shimmy to it.

Let me show you
why I think that's important.

If I move this metronome
while it's ticking...

...Even small movements
have a significant effect

On the periodicity
of its ticking.

I've got a couple of soda cans.

This is my platform with shimmy.

Got a metronome, and I just want
to see what happens

When I put one on here.

Do you see it?

It's totally moving.

This is very cool.

This little metronome
is definitely having

An appreciable effect
on my platform,

And I think it'll have
even more of an effect

If the platform's lighter.

And I've got just the thing.

All right,
this is working great.

It's definitely having
more of an appreciable effect.

Just got a nice
bearing surface platform,

Light aluminum pipes,

And a very light platform
for it to sit on.

I'm taking away as much friction
and momentum as I can

So that only the metronome
is having the effect.

Now, let's try two.

Narrator:
Adam doubles his trouble

With two metronomes
set to the same tick mark.

Look at the movement
on this platform.

Narrator: And after two minutes,
the shimmy takes over.

Adam: Stay with it, boys.

Nice.

Nice. It's totally working.

It just took them a little while
to find each other's rhythm.

Narrator: So, if two will sync,
will five March to the beat?

This pink one is messing
with my mellow here.

Narrator: Well, three minutes in
and something has come unsunk.

This pink one is way out
of phase with the other four.

The other four seem to want to
get into phase with each other,

But the pink one's
not playing along nicely.

[ italian accent ] why can't you
get along like your brothers?

[ normal voice ] all right,
here we go. Let's try.

Narrator: Amazingly,
it seems that adam

Has tickled the pink
just the right amount.

There it is. Okay.

[ laughs ]

We got it working.

[ ticking ]

Yep, they're in sync.

That's awesome.

Okay. Everyone be quiet,
everyone be quiet.

Stop, stop, stop.

All right. Let me explain
what happened here.

This pink one was not
playing well with the others,

And I noticed
when I was watching it

That it was just consistently
a little too slow.

So, on the theory that
the manufacturing tolerances

On these metronomes are loose,

I sped it up by dropping it
a tiny amount

Below its lowest tick mark,

Which is what all the others
are set at.

And that turned out to be
the magic bullet

That helped this all
get in sync.

It's awesome to know.

These are tunable.

Narrator: And now that he's got
his tickers tweaked,

Just how many can he make dance
to his tune?

Got it.

I can't fit any more on here.

1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11.

Dude, it's really
kind of amazing.

They go way out of sync,
then they come back into sync,

And eventually
they find this.

And if one of them's out...

They kind of get him
back in line.

They all just want
to be friends.

They all want to be friends,

They all want to do
the same thing.

Adam's taken this to 11.

I sense a serious escalation
about to start.

[ ticking ]

Narrator:
Down at big break marina...

Oh, you got a good,
raging fire.

Blast it.

Copy that,
we're on the way.

...Tory is zooming
full speed ahead...

Here he comes.
Straight for the pylon.

...To test an emergency
firefighting trick.

I hope this works.

Rip it.

Whoo-hoo-hoo-hoo!

Tory's rooster tail certainly
seems to have doused the boat,

But there's no smoke
without fire so the guys reset.

Reset so we can do it again
with one more pass,

Just to make sure it's out.

I think it's looking good,
though.

Skipper belleci
takes another turn

At fighting fire with speed.

Here we go.
Whoo-hoo!

Yeah!

I think you got it, man.

I think we put it out.

Whoo-hoo!

Kari:
They've just got to be smolders.

There's no way
that's still on fire.

I think it went out
with the first pass.

The second pass is insurance.

I think the third time's
just for fun.

Narrator: Clearly you can
extinguish a fire

With an emergency u-turn.

Kari: Whoa.

Yeah.

Wow, they got so close
to the boat this time.

That was amazing.

Narrator: But now that they know
this firefighting feat

Is no myth, the question is,
should you try this at home?

Tory: That was crazy.

Going at full throttle,
50 miles an hour,

Straight towards a flaming boat.

And then, right before I hit it,
I had to crank the wheel

To spray the water
onto the flaming boat.

Kari: Whoo! It worked!

It worked!
You put out the fire.

Dude, I totally can't believe
it worked, but you know what?

I don't think
I'd try this at home.

Yes, we were able
to pull this off

Despite not being
professional firefighters,

Despite not being
professional boat drivers.

But here's the thing.

In order to do this,
you need to overcome your fear

Of driving directly
at a flaming boat,

And be able to turn
at the last second.

Not to mention,
you need a jet boat.

Unfortunately,

This is not something
that just anybody can do.

Narrator:
Yep, it's always best

To leave the firefighting
to the professionals.

I wonder if jess will let me
borrow his boat again.

Anytime.

[ clicks tongue ]

Adam:
Well, the myth that metronomes,

If placed on a proper surface
and activated together,

Will eventually
sync themselves up

Seems to be
on pretty solid footing.

Got it to work with a couple,
got it to work with a handful,

But now it's time
to go for broke.

In front of me here
is an air hockey table,

And jamie has set out,
carefully, 216 metronomes.

This is more
than we have ever seen

In any of the videos
demonstrating this phenomenon.

In a few minutes, we are hoping

That we'll be setting
an unofficial world's record.

Why are we using
an air hockey table?

Air hockey is a game
in which the puck floats

On a cushion of air.

It's definitely floating.

And now our metronomes
will float on a cushion of air.

That should allow them
the low friction environment

That makes them shimmy their way
to synchronization.

So, how do you want
to do this?

I'll start at this corner.

Why don't you start
at that corner,

And we'll just go for it?

All right,
you want to count it in?

[ chuckles ]
all right.

Three, two, one, go.

[ ticking ]

Narrator:
It's a painstaking task

To start all the metronomes
one by one.

Done with my half.

But now that they're ticking
at the same tempo,

In theory,
they should start that shimmy.

Now they're all going.

They're all going,

And they're floating
on the cushion of air.

I'm really -- I'm totally
hypnotized by the sound.

I know.

But with 216 metronomes,

Almost 20 times the amount
of their last attempt,

Can they break a world record,

Or will the metronomes
March to a different tune?

Narrator: It's the "do try this
at home?" special,

And next up, adam and jamie
are investigating

The old ball chain.

We all know what this stuff
is -- regular chrome ball chain.

Keys, ids, and dog tags

Have been hanging from it
for decades,

But we've got a viral video

That seems to show this stuff,
under the right conditions,

Behaving almost against
the force of gravity.

Narrator: So, supposedly,
this gravity defying feat

Is achieved without any
special effects wizardry,

But are they yanking your chain,

Or could you really recreate it
with just a ball chain,

A beaker, and, if you have one,
a high speed camera?

Check this out.

Let's check out the high speed.

Hey, adam.

No.

It's like it's going all the way
across the room.

Wow.

It doesn't look like it should
be able to do that, does it?

No.

It's like magic.

That is freakin' gorgeous.

That is so freakin' cool.

Narrator:
Cool and surprising,

As the ball chain seems
to levitate out

And over the lip of the cup,

And this strange behavior
has gotten jamie thinking.

Jamie: Now, we've got
some bigger chain.

Let's see if it goes further.

Narrator: It does seem
the bigger the ball,

The greater the effect,

But is this gravity defying act

Also related to the distance
you are from the ground?

Okay, let's see what this does
from eight feet up.

That made a difference.

It's clear from our testing

That there are two key forces
that are causing this effect.

And the first is that mass
moving in a particular direction

Wants to continue moving
in that direction,

So when we're yanking the chain
up out of the pot,

It wants to continue
moving upward,

But shortly after, gravity
starts to pull it down,

And so that's where we get
this arc.

If one of these forces
is out of balance,

Like, as in if gravity starts
to pull down too hard,

Then we don't get
as large of an arc.

But when these two forces
are perfectly balanced,

Coupled with the unique
symmetrical and slick

Design of this chain,
it all converges

To create an arc that seems like
it should be impossible.

But whatever the explanation,
it's a really cool effect.

Narrator: It's cool,
and to take it to the max,

Adam's got this one
all chained up.

Wow.

The biggest ball chain
I could possibly buy.

Whenever you're ready.

Here we go.

[ laughs ] wow!

That was amazing.

That worked really well.

Adam: It's almost magical
watching the chain flow,

Seemingly defying gravity,
out of the cup.

My favorite part about it,
though,

Is that is seems to be
proportional

To the size of the ball chain,

So you get a little loop
with stuff like this,

And you get a nice giant loop
with stuff like this.

I didn't even know they made
stuff this big until this story.

This is awesome.

Narrator: Yep, this chain
reaction is surprisingly diy.

So, break out the beakers
and the ball chain,

And make sure
that you do try this at home.

Next, the team
is on a chemistry safari.

All right,
these next chemical experiments,

Fans want us to test,
one, if they're genuine

And two, if it's something
that they can try at home.

What are they?

Elephant toothpaste
and exploding snakes.

Elephants
and exploding things?

Are we sure
that this is something

That people can do
at home?

Narrator:
Well, with an ingredients list

Made up of household items,

Elephant toothpaste is the first
diy science to try.

All you need's
a little hydrogen peroxide,

The kind you would get
for dying your hair,

Liquid dish soap,

Little food coloring
for pizzazz.

Ooh.

And, finally, the catalyst,
which is plain old yeast.

Are you about
to blow our minds?

I am.
Stand back.

Whoa.

Whoa.

It's like a volcano
from science fair.

Look at that.
It's minty fresh.

Narrator: It's easy to see
why this super-sized foam

Is called elephant toothpaste.

Now, in its basic form, hydrogen
peroxide is extremely stable,

But what's happening here
is when you add the yeast,

It's decomposing the hydrogen
peroxide very rapidly,

And releasing oxygen.

The oxygen is getting captured
inside the liquid dish soap,

Which is creating bubbles

And this big, foamy,
awesome mess.

Narrator: And although it passes
the try this at home test,

It's just a frothy fountain.

So how about an only on
"mythbusters" twist?

Don't try this at home.

[ siren wailing ]

All right,
to take this experiment

From "go ahead, try it at home"
to "mythbusters" danger,

We're gonna use some lab grade
components here.

We have a higher concentration
of hydrogen peroxide,

And for our catalyst,
potassium iodide.

Now, these are much more caustic
chemicals here,

And the reaction
is a lot more energetic.

Narrator: Okay, so take two,

But this is definitely
a do not try at home.

One step back.
Is it gonna get crazy?

Yeah? You about to drop
some science on us?

You ready?
Do it.

Whoa.

Holy crap.

What the heck?

Much more energetic
experiment.

Look how hot it is.

You can see the steam
coming off.

Narrator: Yep,
that's the kind of toothpaste

An elephant would be proud of.

Kari: There you have it.

Two versions
of elephant toothpaste.

The first, definitely a try it
at home experiment.

It's just household items
like peroxide and yeast

Give you this beautiful fountain
of magical foam.

The second,
a little more dangerous.

We're talking about
lab grade ingredients,

Creating an exothermic reaction
with a lot more oxygen,

A lot more heat, and a much more
spectacular mess.

Definitely worth the clean up.

But I still don't understand

Why they call it
elephant toothpaste.

I wasn't aware that elephants
brush their teeth.

Narrator: But now we've seen
the toothpaste,

Didn't someone mention
an exploding snake?

Grant: Now, for the most part,
elephant toothpaste

Is the sort of experiment
you can do at home.

This next one
is a little bit different.

It's called explosive snake.

Now, the first part of it
involves sugar,

Which, by itself, is innocuous.

The part that makes it different
is the other half,

Which is this -- sulfuric acid.

Tory:
Look at that. Wow!

Sulfuric acid is corrosive.

It's caustic, and if you
splash it on your skin,

You could get severe burns

So, unfortunately,
not the sort of thing

You want to try at home.

And to do this experiment,

I think I'm gonna need
a slightly different wardrobe.

Ah, that's better.

So, I've got an apron
to protect my clothing.

Acid gloves
should protect my hands,

And a face shield for my face.

Now it's time
to mix up the elements.

Narrator: It's another
do not try this at home,

But will it be explosive?

Grant:
Okay, so it's coming.

Narrator: Eh, actually, no.

[ coughing ]

Okay, so what happened here?

Well, the acid interacts
with the sugar

And breaks it down
into its components,

Releases water
in the form of steam,

And it leaves behind carbon,
which is what the snake is.

Now, it's a very cool reaction,

But not necessarily
all that explosive.

I think in order to be
explosive,

It should be faster
and more violent,

And I think I can find
a reaction that does that.

Narrator: So lab raider imahara
swaps out the sugar

For a classified
organic compound,

Adds the sulfuric acid,

Then brings a little heat
to the equation.

But will this result
in that explosive snake?

Grant: Watch it.

Okay, don't blink 'cause this
can happen really fast.

Okay. This is it.

No way!
That's amazing.

Narrator: It's an instantaneous
process called de-ammonization.

[ coughing ]

Narrator: The sulfuric acid
dehydrated the compound,

Leaving in its wake
a flaky carbon snake.

Grant: So, conclusion --

Two explosive snakes
by different means,

But unfortunately
because of the sulfuric acid,

You can't try either of them
at home.

Narrator: So while both myths
are confirmed,

Unless you've got access
to a lab tech

And lab grade materials,

You can't try these at home.

Meanwhile,
back at metronome hq...

Adam: Every now and
then, it sounds like
they're getting together.

Yeah.

I do think that they cross
phases somehow,

But I think they may be
in sequence,

But not
in the correct position.

If you look down the line,

There's no rhythm or reason
to this.

It's a case of so far,
not so good.

What you're about to see
could be dangerous.

We're trained professionals

So, please,
leave the myth busting to us.

Welcome to "mythbusters".

On today's episode, we're doing
things that you can try at home.

I'm gonna show you a few things

That you should never try
at home.

Swimming with sharks.

Kari: Oh, my god.
Don't do that.

Getting in the ring with a bull.

Don't do that.

Don't ride a rocket-powered
surf board.

Don't get chased by crocodiles.

And definitely don't try to jump
over a wagon on a bike.

Who would be crazy enough
to do all those things?

Narrator: Who, indeed.

And next, could this soda stunt
do you harm?

Next up is a story

That should definitely never
be tried at home

Or anywhere else
for that matter,

Given that it's illegal
in a bunch of states.

What's that?

Dry-ice bombs.

Yep, well, exploding things
is never a good idea to try,

So why is it we're tackling it
on this show?

Because like it or not,
people do try this at home.

These things put out
a tremendous bang.

I think they also put out
a tremendous bite.

That's what we want
to look at.

So we want to find out just how
dangerous they really are?

Exactly.

We're gonna look precisely
at why

You should not try
dry-ice bombs at home.

Narrator: This diy device

Works on that old trapped
pressure principle,

Which the myth busters know can
be both spectacular and lethal.

Oh!

But just how lethal will these
dry-ice bombs turn out to be?

To find out,
adam's got to set his cap first.

The capping it and getting away
is where the real danger is.

I've seen these things go off
as quickly as a few seconds,

So I don't want to be
anywhere near these things

When we're trying to film them
on high speed camera

And assess their damage.

That might work.

Now, we're gonna be conducting
this test with bottles

As different as this one
and this one,

But I need to put the caps
on all of them,

And my method is gonna be
using this thing

Because it has a handy
turning part out the front.

[ drill whirs ]

[ laughs ]

That's how we're gonna do it.

Narrator: Adam sorted
the hands-free capping.

Put your forearm
into that hole.

But now jamie needs to give
this dry-ice combo a hand.

Jamie: We want to find out
exactly how dangerous

This is to somebody
that might be holding onto it.

Obviously, we're not gonna use
our own hands for that,

So we're gonna need
some artificial hands.

Beauty.

That came out perfect.

So we've got our complete set
of hand molds now.

All we have to do
is put these skeletons in them

And then put the tops on them,
strap them together,

Fill them with rubber,
and we're good to go.

Since we're anticipating
a little bit of physical damage

To the hand, we might as well
make it look good.

Oh, yeah.

Oh, it's so pretty.

Nice. It's gonna be perfect
for the test.

Yeah.

Narrator:
So, now they can get hands on
with their dry-ice device.

I'm not running
for my own recreation.

Who would do that?

No, I'm running
because this is our location

For detonating
the dry-ice bombs.

That's right.

We've come to the bomb range

Because that's how seriously

We take the danger
of these things.

Narrator: It's serious,

Because although soda bottles
are designed

To resist the pressure
of their carbonized contents,

Expanding dry ice
is a whole 'nother ball game.

Perfect.

So what are we doing?

Well,
we're putting frozen co2...

Yep, this stuff,
known commonly as dry ice.

...Inside a sealed container

Along with a little bit
of water.

The water converts
the frozen co2 to gaseous co2,

Expanding to between 500 and 800
times its original volume.

Which'll increase the pressure
inside the container

To in excess of 100 psi,

At which point
it'll rupture violently,

Releasing all of that gas,

Not unlike what happens
when you set off an explosive.

Boom.

Narrator:
Yep, so now it's time

To bring some data
to the equation

And find out just how damaging
those booms can be.

Back at the shop...

What is your problem?

...Things are starting
to wind down.

Ah! [ laughs ]

Keep going,
keep going.

So adam and jamie
are winding them up again.

Remember, kids, this is
something you can do

With that extra 200 metronomes
you've got around the house.

After 30 minutes of ticking,
adam tries a last ditch attempt

To nudge the metronomes
into sync.

[ ticking ]

Oh, look at that.

But as soon as he stops,
they come out of phase.

They're starting
to run out.

Ohh!

[ laughs ]

And it's clear this game is up.

Adam: Jamie and I started them
one at a time.

We were able to get them all
going in a couple of minutes,

But they never quite
got synched up.

You could hear them going
in phase and out of phase.

That one's out,
that one's out.

And certainly looking
down the aisles

And through the columns,

They looked awesome
and they sounded amazing,

But they never quite got
all in sync together.

I love the sound,

But this is not a successful
world record attempt.

Every now and then,
you could hear them sort of --

It sounded like they were
marching in step,

And then they'd March
right back out of step again.

This just totally didn't work.

Narrator: Despite the high tech,
low friction air hockey table,

The metronomes just didn't want
to synchronize.

Adam: So, clearly,

While these metronomes
work fine individually,

There is enough variation
in the manufacturing tolerance

That to get them all ticking
in perfect sync,

You would have to calibrate
each one individually.

Now, if you want to cross
calibrate 216 metronomes,

By all means go ahead
and give it a try.

[ ticking ]

This one's still going.

Shut up.

This is the biggest fail
we have ever achieved.

All that work.

Yeah,
you can try this at home.

Your results may vary.

See you next time.

Now, we found this one
on the internet.

A man made a video
of water coming out of a hose,

And he made the water
freeze in space.

I did exactly
what he said to do.

I got a speaker.

I taped a hose
with running water to it,

And then I attached it
to a tone generator.

Now, there's one last piece
to this puzzle,

And that's a video camera.

You ready to have
your minds blown?

Look!

Grant:
Whoa! [ laughs ]

Now, watch this.
I can make it go backwards.

I'm gonna take it to 22 hertz.

It goes backwards.

What?
What?

Now, the whole reason
this optical illusion works

Is 'cause you are shooting
24 frames per second.

If you set the hertz around 24,
it vibrates the water

So that the water's
in the same place

Every single time
the camera takes a picture,

Which makes it look like
the water is frozen in space.

And if you play around
with the hertz,

You can actually make it look

Like the water
is going in reverse.

It's not really,
but it looks like it.

Kind of cool.

[ siren wailing ]

Wow. Look at that.

That is the biggest test tube
I've ever seen.

Now, you've seen
elephant toothpaste.

What I'm gearing up for now

Is something you've never seen
on television before

And definitely shouldn't
try at home.

That is monster toothpaste.

We're super sizing it.

Go ahead. Take me up.

Narrator: With over 200 times
the raw ingredients,

This will be monster toothpaste.

You guys ready?

I think the question is,
are you ready?

She looks ready.
Do it.

Okay.

Here we go.

This is
monster toothpaste.

Oh, all right, go.
Back me up.

Whoa.

Oh, my god.

Holy...

Nice.
Anybody want a brush?

Oh, my god.

That's cool.

That's insane.

Tory: That was crazy.

Kari had this giant test tube.

She poured in
the potassium iodide

And then the thing erupted.

I didn't think it was gonna go
very high, but it did,

And look at the mess we created.

So definitely don't
try this at home.

Sure, monster toothpaste.

Sounded like a good idea
at the time.

Who has to clean it up, huh?

Narrator:
Just how hazardous

Is a dry-ice device
to your health?

Well, now it's time to tune
into the data and find out.

So, david harding
and his equipment,

Which is in the form
of some pressure sensing pcbs

Placed strategically
around the explosion,

Is gonna tell us
exactly how powerful they are.

David, you ready?

Ready.
All right.

Ice is in the bottle.

Sensors are in place.
Cameras are rolling.

It's time to add water.
[ chuckles ]

Just add water.

You better get to a safe place.

Oh, it's getting bulgy.

Jamie:
You know, it's funny.

Co2's what's normally
in those soda bottles.

This is sort of extreme soda,
isn't it?

I think this one's gonna go
a little quick.

I hope so.

Yeah.
Nice! [ laughs ]

The piece just fell down
after, like, five seconds.

Narrator:
The dry ice blitzed the bottle,

But just how bad was it?

What did we get?

Harding: Three psi
from that explosion.

That's it?
That's all.

However, it looked like
it blew out the bottom,

Where we don't have
any direct sensors.

So that might be
a falsely low rating?

That's right.

And as it happens,
we've got some more data.

Check this out.

[ laughs ]

Whoa!

No way.

That's steel,

And it's steel
with an angle on it

So imagine what that'd do
to your hand.

I mean,
that's got to hurt.

And that was just
a little bottle.

Let's try the big one.
Okay.

Narrator:
So the 350 mil explosion

Was steel bendingly strong,

But as the two liter bottle
distends and elongates

With the expansion of the gases,

Will it prove
even more dangerous?

Jamie: It's changing shape
at the bottom.

Adam: Look at that.

It's gonna be a good one.

Wow!

Getting longer.
Oh!

Oh!

That was good.
That was intense.

Intense, just like the data
from the pcb sensors.

Jamie: The sensor results from
the big bottle going off are in

And they're more than double
what the little bottle put out.

They were seven psi.

Now, that's enough to cause
permanent hearing damage.

As to what other kind
of injury it could cause,

The sensors may not be
telling the full story.

Show of hands,
who wants to ramp it up?

Narrator: The numbers alone
say you should never try this,

But there's still
the damage test to go.

Adam:
Yeah, I got a prediction.

I don't think the explosion
we're gonna see

Is gonna be as big
as this crater that jamie made

When he arrived at work
this morning...

You happy?
Yeah.

Let's do it.

...But I do think
that after watching

What it does to the hands
on either side of the bottle,

You're not gonna want
to try this at home.

Frankly, I've always wanted to
do this particular experiment.

Narrator: From the start,

The expansion of the co2
pushes the hands apart.

It's moving.

It won't be long now.

Oh!

[ laughs ]

That was loud.
Yeah.

That violent rupture
sent the arms akimbo,

But although they seemed
to flail away from the pressure,

Surely they're not undamaged
by all that psi.

[ laughing ] oh!

I got a broken wrist
right here, jamie.

Yeah, I'd -- I'd say so.

Look on -- it whipped it around,
both of these.

Yeah, yeah, yeah.
We got some lacerations here.

Maybe some broken fingers.

Yeah.

We got a compound fracture
in the finger.

Oh, and check this out.
There's a --

There's plastic
embedded in the flesh.

Right.

That's gonna be part
of what ruined your day,

Although you won't be able
to hear anyone

Tell you about
how stupid you just were,

'cause you'll have
permanent hearing damage.

Yep, not only
was the force enough

To force bones through flesh,

A halo of plastic shrapnel
was embedded into the hands.

Look, we called this episode
"do try this at home"

Because we've spent
more than a decade

Doing all sorts
of random dangerous things

That you should totally not
try yourself.

Aaahh!

But we had to end it here

With something we hear
about a lot of people doing,

And we wanted to make it crystal
clear for you,

And we think we have,

That putting dry ice and water
in a soda bottle

Is no laughing matter.

You could be permanently damaged

By "playing around"
with something this dangerous.

Don't do it.

So, we have microwaved,
speed boated, synchronized,

Levitated, frothed,
suspended, and exploded.

And out of all of that,

Four are definitely
too dangerous to try at home.

And when it comes to the others,
please make sure

You're with a responsible adult
and use your common sense.