[zigzaggy]

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

[jussij → zigzaggy]

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...

[macintux → jussij]

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