Back to Show
PBS Space Time
Why Do You Remember The Past But Not The Future?
Season 7
Episode 1
The laws of physics don’t specify an arrow of time - they don’t distinguish the past from the future. The equations we use to describe how things evolve forward in time also perfectly describe their evolution backwards in time. Why does the brain and the conscious experience that emerges from it, see the arrow of time so clearly? In other words why do we remember the past and not the future?
Sign up now for inspiring and thought-provoking media delivered straight to your inbox.
Support Provided By

19:25
What if gravity isn’t weirdly quantum at all, but rather … just a bit messy?

17:02
Have we reached the end of the line of discoverable elements?

15:32
Can we change the color of a black hole?

18:26
Learn about Nobel laureate Roger Penrose's idea of how consciousness is caused by quantum processes.

16:28
Faster than light travel may produce gravitational waves that we could see here on Earth.

20:07
All particles belong to two large groups: fermions and bosons.

16:11
Just how much stronger is this year’s solar activity going to get?

17:25
So you’ve decided to jump into a black hole...

12:51
We only recently figured out where cosmic rays are coming from.

13:28
Black hole complementarity may force us to rethink what it means to say that it exists.

20:15
To travel the stars without faster than light travel we’re going to need a generation ship.

16:19
Today we are jumping into a black hole. Again.