xkcd #2847: Dendrochronology ( imgs.xkcd.com )
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Alt text: My first words were ‘These were my first words; what were yours?’
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Title text: An apple fell on Isaac Newton’s head and gave him the idea that the moon might be a tasty apple, though this turned out not to be true–the Apollo program eventually determined that it was just a desolate and bland Red Delicious....