New Theories: Time Moves in Two Directions (Scientific American)

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Time only goes forward, right? According to “time-indifferent laws of physics, time’s arrow may in a sense move in two directions, although any observer can only see and experience one,” explains Lee Billings in Scientific American.

While the controversy of “time’s arrow” has unfolded for more than a century, recent models suggest that we may be living in the past of a parallel universe.

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