The director of “Particle Fever” talks about his film.
How time travel might explain some of science’s biggest puzzles.
Past and future may not be what they seem.
Sean Carroll and Alan Guth talk about time.
Lee Smolin argues that time is more fundamental than physical laws.
If the constitution of nature itself were changing in time, how would you know?
To John Archibald Wheeler, the race to explain time was personal.
What happened before the Big Bang?
How to see yourself in a world where only math is real.
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