http://bit.ly/17VS86H
Awesome XKCD comic. Caution: you may spend some time on it, as Rob Ryan pointed out on Reddit http://www.reddit.com/r/xkcd/comments/1czlde/time_machines/ . Thanks Ben Rolfe for posting and wasting (ahem, entertaining) the better part of the last 15 minutes of my life. 😉
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