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Hydra. CC BY-NC-ND 2.0 Jasper Nance / https://flic.kr/p/2JShUR Sleep is one of biology's biggest mysteries. Every species with a nervous system has some form of resting period, and so one theory for why animals sleep is that it…

Brown treesnake on a pole. Bruce Jayne Scientists have discovered a new method that some snakes use to climb trees. The previously unknown mode of locomotion was observed in the brown treesnake, which forms a loop around a…