This seems paradoxical, since a video of a single particle in motion looks equally valid running forwards or backwards. We live life forward as time flows from past to future, and believe that any closed system, like a box of particles, follows an “arrow of time” into the future as the system’s entropy grows. Sidney Perkowitz reviews The Janus Point: a New Theory of Time by Julian Barbour Time complexity Is time an arrow that only moves forward? Or is it symmetric, moving in opposite directions? (Courtesy: iStock/funky-data)
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