It seems obvious that time runs in one direction- people don't grow younger and an egg can't be unscrambled, for example. But why is this so? In his book "From Eternity to Here," physicist Sean Carroll seeks to create a better understanding of time. According to Carroll, time's one-way arrow is due to conditions before the Big Bang. He argues that our universe is part of a larger family of universes- and that in sibling universes, time runs in the opposite direction. He touches on subjects from entropy and quantum mechanics, to time travel and the meaning of life. Carroll joins Larry Mantle to explain the mind-boggling concepts of time.
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