The Prime Cicada

"They live underground for 13years, 17years or other prime numbers, emerge for 3 weeks, eat, mate and then disappear underground again for another 13 to 17 years - why?" What is a Cicada? - Watch the two videos below to see Cicadas in action. Why does the Cicada come out every 13years? Or 17 years? Eat, mate, and then disappear back under the ground again for another 13 or 17 years? Prime Numbers, having...

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