We Traveled Back in Time. Now Physicists Are Angry.

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Time travel is possible. In fact, you’ve been doing it since the day you were born. But what if we told you there’s a way to hack the universe and manipulate time itself?
We just have to do two simple things to make it happen:
1. Make a lot of physicists grumpy.
2. Shoot one twin through space against their will, while the other chills on Earth.
Let's go!

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[olafmesschendorp]

"One beer for me please" he says


A Tachyon walks into a bar

[nlswchrng]

What this video taught me is that speeding makes you live longer

[Dang.-]

The message saying "Run" to the twins from before is gold 😭

[AngelinaHickman-ph]

7:19 It's theorized that the opposite is true for superluminal objects. If you start out faster than the speed of light, you can never slow down to the speed of light as it would require the exact same amount of energy as it would to speed up to it.

[np]

Everyone commenting on this video already must have time travelled to finish it.

[betterchapter]

Excellent video. Will have to watch it again yesterday, since I've already seen it tomorrow.

[heramaaroricon]

The professors getting mad and breaking a ruler was so good. Made me smile.

[HeartlessKnave]

The Flash: No, it was me, Eobard, _I_ did it all.

Zoom: It was me, Barry, I... wait what?

[EmmanuelGiouvanopoulos]

"You can get as close as you like, but you can never reach it" has the same vibes as
"You can check out any time you like, but you can never leave"

[rtg_onefourtwoeightfiveseven]

As a physicist, I appreciate that the idea that this is an oversimplification is being made clear to avoid the maths. That said, I do have to make one "um acktchually".
5:54 Moving faster than light doesn't NECESSARILY mean you're moving back in time. What it does mean is that you're moving forwards in time in some reference frames, backwards in time in others, and are "stationary in time" in yet others. It's exactly the same as how moving slower than light means you can be moving forwards (in space) in some reference frames, backwards in others, and are stationary in space in yet others.

[ceciljoel]

"shaping the future is much easier than changing the past " is kind of motivational

[RILDIGITAL]

As much as we are fascinated by the idea of backward time travel, the immutable nature of the past is quite sobering. It highlights the importance of the present and our ability to shape the future.

[cirkulx]

0:01 "You're going through time 1 second, every second."
"Every 60 seconds in Africa, a minute passes."

[shamshersingh]

3:39 "younger twin is ready to take years of therapy for being abducted by physicists" 😂😂 still cracks me up like it did when it came out 6 years ago!

[ethribin]

"Your speed is constant.
So the faster you move thtough the space dimensions, the slower you mpve through the time dimension, and vice versa."

Thats a very good descriptionnof time and space dilation!

[Alphalafel]

The background music is so underrated! It’s amazing and so well made! I love the simple chord progression with combined with a catchy rhythm.

[BJV]

"Yes I am."
"Are you a time traveler?"

[potjie]

Wow can't believe this video is already 10 years old. Feels just like this morning when I watched it for the first time!

[PerpendicularFlight]

How are y'all pumping these videos out so fast? I remember back when I had to wait a good month for a new video.

[foogod]

One possible reason that we've never actually found any tachyons is because, arguably, it's probably impossible to tell the difference between an elementary particle travelling forwards in time from A to B in space vs a particle travelling backwards in time from B to A. Therefore, potentially, _every_ regular particle in the universe (except photons) is also a tachyon at the same time, if you just look at it from the other direction.