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Lifer
Hundreds of tiny worms were discovered living amidst the wreckage of the space shuttle Columbia. The invertebrates had been part of a NASA science experiment aboard ship. Somehow, the little creatures managed to withstand the re-entry through Earth's atmosphere. According to a NASA spokesman: "To my knowledge, these are the only live experiments that have been located and identified." The rest of them are on the loose and headed over to your place.