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xkcd - A Webcomic - Astronomy (1522)
 
Image:
 
Astrobiology is held back by the fact that we're all too nervous
to try to balance on the ladder while holding an expensive
microscope.
 
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xkcd - A Webcomic - Sword in the Stone (1521)
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xkcd - A Webcomic - Microdrones (1523)