Famed physicist Stephen Hawking is making headlines: First, for his recent claim that aliens will come exploit planet earth for its resources. And now -- another huge claim: that time travel is possible.
■Class discussion: Hawking says he has thought about time travel and the possibility of an alien takeover for a long time, but never discussed it, for fear he'd be labeled a "crank." Do you think Hawking has gone off the deep end? Do you think aliens are coming? How far into the future would you want to go, if Hawking is right?
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