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cicadas run on a non-base 10 time system, though. so no decades....
Nearly all cicadas spend multiple years growing underground as juveniles, before emerging above ground for a short adult stage of several weeks to a few months. The seven periodical cicada species are so named because, in any one location, all of the members of the population are developmentally synchronized—they emerge as adults all at once in the same year. This periodicity is especially amazing because their life cycles are so extremely long—13 or 17 years (both prime numbers).
the next emergence in NJ will be in 2013.
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