Physicist Sean Carroll, blogging at Discover Magazine online, offers up these rules for time travel.
Rule No. 10 is bound to be a major disappointment for those of us who wish we could re-write our past decisions. Of course, if we actually could go back and do that, the movie The Butterfly Effect shows us the horrifying consequences: We would become Ashton Kutcher.
(H/T Opuszine)
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