The rest of it is vacuum.
What seems to happen is that particles
appear and disappear all the time.
So where do they go
when they're not here?
Now, that question is tricky.
I'm gonna give you two answers--
Answer number one:
They go into
an alternative universe...
where the people in that universe
are asking the same question...
about those particles when
they come into our universe.
They say, ''Where do they go?''
[ Chuckles ]
[ Man ] There's a great mystery called
the mystery of the direction of time.
There's a certain sense in which the
fundamental laws of physics that we have...
don't make any interesting distinctions,
say, between past and future.
Um, for example, it's a puzzle from the standpoint
of the fundamental laws of physics...
why we should be able to...
um, remember the past, um...
and not have the same kind
of epistemic access to the future.
It's a puzzle from the standpoint
of these laws...