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The final part of the book is the two-faced or Janus-faced universe a low entropy starting point in time at the big bang, with time flowing to ever-increasing entropy in both directions from this zero time point.

Quantum theory, big bang cosmology, inflation theory, and eternal inflation
https://youtu.be/nziePav5OMg?si=AfmDE...

Poincare recurrence problem here is a video by Disculogic. https://youtu.be/p58byzN0vuU?si=6aDX1...

Newtonian billiard balls and the direction of time and entropy, and problems with statistical probabilities of Boltzmann.

Some chapters on Relativity, time warping, and time travel.

The big bang was remarkably smooth and low entropy, which is a puzzle. Why was entropy so low at the time of the Big Bang. Low enough to allow us to exist in a low enough entropy time 13 billion years later.

Introductory chapter on the nature of time as seen through common sense, and chapter two was on entropy and the arrow of time.

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