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Sexual competition persists long after mating, all the way down to the proteins that put an efficient head on a swimming sperm.

SMELL DETECTORS  A researcher whiffs a scent-containing vial used in experiments indicating that people can identify at least 1 trillion different odors.

SMART BLOB  Embryos may not look as if they can do much, but new tests suggest that a lot of unfinished creatures, such as this unhatched chicken, can regulate their temperatures by moving to warmer or cooler zones of eggs.

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