"Things You Learn", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License
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Guess who has two thumbs and spent the night in an ER after trying to rescue a kitten that ran under his car at a stoplight and climbed up into the engine compartment? And, thanks to antibiotics, will continue having two thumbs? THIS GUY. (P.S. kitten is safe!)