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If Einstein's right, or if the general relativity is correct, then the universe is expanding, yes?
Yes.
So, if you reverse time, then the universe is getting smaller.
Alright.
So, what if I reverse the process all the way back to see what happened at the beginning of time itself?
At the beginning of time itself?
Yes. So the universe, getting smaller and smaller, getting denser and denser, hotter and hotter, as we're...
We wind back the clock?
-Exactly, wind back the clock! -Wind back the clock.
Is that what you're doing? You're winding back the clock?
That is what I'm doing!
Oh, keep winding. I mean you got plenty of way to go! Keep winding!
I don't want to fall in.
Well, we gotta get back to the beginning of time, we got a long way to go, keep winding...
until you get...
A singularity.
A space-time singularity. So the universe' born from a black hole exploding.
Keep going.
What do you mean keep going? What... before the universe began?
No, no... keep going, develop the mathematics.