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We don’t have locusts but down here in the southeast US we have cicadas every dozen or so years.

In fact Cicadas emerge on 7, 13 and 17 year periods.

The theory for this 'prime number' periodic cycle is quite interesting: https://www.abc.net.au/science/articles/2001/11/27/421251.ht...

Thank you, that is fascinating, as is the postscript.