A new book, From Eternity to Here: The quest for the ultimate theory of time, by Sean Carroll, suggests an eternal "mother space-time" producing a multiverse of baby universes some of which will have an initial entropy level that means time flows like it does in our universe. Craig Callender, a philosopher of science, who reviews the book in the 23rd January issue of New Scientist is not so sure. Sean Carroll meanwhile answers some readers' questions about time in that same New Scientist issue with more Q&As at www.newscientist.com/blogs/culturelab.
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