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Scoop.it!
From
io9
Cicadas incubate underground for long years. They emerge every 13 or 17 years to mate and make annoying noises when people are trying to sleep. Both 13 and 17 are prime numbers. 
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Scoop.it!
Creatures on Earth have annual cycles consisting of life history stages of breeding, moult and migration. For some, moon cycles influence their periodic behavior, particularly in the case of birds.
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