1
00:00:17,479 --> 00:00:20,063
"Hey, another atom.
I'm hydrogen, nice to meet you.

2
00:00:20,063 --> 00:00:22,033
How are you feeling about the jump?"

3
00:00:22,033 --> 00:00:24,955
"Hi there, I'm antihydrogen,
your antiatom,

4
00:00:24,955 --> 00:00:27,119
and to be honest, I'm feeling
kind of neutral.

5
00:00:27,119 --> 00:00:31,509
My positron and antiproton balance out,
just like your electron and proton, right?"

6
00:00:31,509 --> 00:00:34,504
"Hey, yeah! You look just like me,
but different somehow."

7
00:00:34,504 --> 00:00:38,498
"Whoa, be careful! If we get too close,
we'll disappear in a spark of energy.

8
00:00:38,498 --> 00:00:40,256
I'd like to stay in one piece."

9
00:00:40,256 --> 00:00:41,403
"Oh wow, sorry."

10
00:00:41,403 --> 00:00:43,102
"It's okay. I was just thinking,

11
00:00:43,102 --> 00:00:44,081
it's kind of weird for us to be

12
00:00:44,081 --> 00:00:46,502
chatting like this before our 
jump above CERN."

13
00:00:46,502 --> 00:00:47,486
"Why's that?"

14
00:00:47,486 --> 00:00:50,010
"Well, for starters, how do we know
we'll both fall?"

15
00:00:50,010 --> 00:00:51,821
"Of course we'll fall. It's gravity,

16
00:00:51,821 --> 00:00:54,224
you know, the force of attraction 
between masses.

17
00:00:54,224 --> 00:00:56,012
I even know how fast we should fall.

18
00:00:56,012 --> 00:00:58,350
Galileo showed in that tower experiment

19
00:00:58,350 --> 00:01:02,736
that all falling objects accelerate 
at the same rate, regardless of mass."

20
00:01:02,736 --> 00:01:04,535
"That's for bigger objects.

21
00:01:04,535 --> 00:01:07,682
It's a different story 
for small particles like us.

22
00:01:07,682 --> 00:01:11,818
Our mass is so tiny that the gravitational
force we experience is miniscule,

23
00:01:11,818 --> 00:01:16,526
and if the particles are charged, 
like my antiproton or your proton,

24
00:01:16,526 --> 00:01:18,697
then it becomes impossible to detect


25
00:01:18,697 --> 00:01:22,199
compared to the much greater
electromagnetic force acting on them."

26
00:01:22,199 --> 00:01:25,468
"But that's only for charged particles.
You and I are both neutral.

27
00:01:25,468 --> 00:01:29,029
Our charges balance out,
so the electromagnetic force is small

28
00:01:29,029 --> 00:01:31,368
and the gravitational force
should be detectable.

29
00:01:31,368 --> 00:01:32,921
I know mine's been measured."

30
00:01:32,921 --> 00:01:36,019
"Because you're everywhere, 
but I'm kind of hard to find."

31
00:01:36,019 --> 00:01:37,757
"Why is that, anyway?

32
00:01:37,757 --> 00:01:38,977
Shouldn't there have been an equal amount

33
00:01:38,977 --> 00:01:41,359
of matter and antimatter created
in the Big Bang?"

34
00:01:41,359 --> 00:01:43,845
"You'd think so, but then all of
those particles

35
00:01:43,845 --> 00:01:46,833
would have annihilated 
each other into energy, remember?

36
00:01:46,833 --> 00:01:49,284
And the Universe is obviously
full of matter.

37
00:01:49,284 --> 00:01:52,304
No one knows why there is more matter
than antimatter,

38
00:01:52,304 --> 00:01:55,088
which is why scientists
are so interested in studying me."

39
00:01:55,088 --> 00:01:56,924
"So where do they find you anyway?"

40
00:01:56,924 --> 00:01:59,200
"Actually, I was made in that 
lab down there.

41
00:01:59,200 --> 00:02:03,875
They needed an accelerator to make
my antiproton because it's so heavy,

42
00:02:03,875 --> 00:02:05,487
just as heavy as your proton.

43
00:02:05,487 --> 00:02:07,329
Getting my positron was easier.

44
00:02:07,329 --> 00:02:10,230
It's much lighter, like your electron,
and there are materials

45
00:02:10,230 --> 00:02:12,732
that naturally decay by emitting one.

46
00:02:12,732 --> 00:02:15,494
Then they just had to put the two together
and they got me.

47
00:02:15,494 --> 00:02:16,558
But it's only recently

48
00:02:16,558 --> 00:02:18,042
that they've been able to keep me


49
00:02:18,042 --> 00:02:20,306
around long enough
to study my properties."

50
00:02:20,306 --> 00:02:24,305
"And now they've sent you on this
jump with me. Hey, wait a minute."

51
00:02:24,305 --> 00:02:28,041
"That's right. We're reenacting
Galileo's experiment,

52
00:02:28,041 --> 00:02:31,901
but with matter and antimatter
instead of two objects made of matter."

53
00:02:31,901 --> 00:02:33,356
"So what's going to happen?

54
00:02:33,356 --> 00:02:35,101
Are you going to fall 
upwards or something?"

55
00:02:35,101 --> 00:02:36,578
"Only one way to find out!"