Why is Time a One-Way Street?

I was randomly browsing /jewtube/ and found an interesting talk by The Susskind that you may like if you enjoy physics or cosmology:

https://www.youtube.com/watch?v=jhnKBKZvb_U

It discuss the idea of Boltzmann brain^[1], which is also pretty cool.
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[1] - https://en.wikipedia.org/wiki/Boltzmann_brain}

No. Back to the jewtube, please.