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dmckeon
2536 days ago
Or appear every 13 or 17 years, like some cicadas.
https://en.wikipedia.org/wiki/Periodical_cicadas#Lifecycle
1 comments
nemonemo
2536 days ago
This is a great natural wonder. Thank you.
It also invalidates my logic. Maybe there could be some vector with biannual periodicity.
link
It also invalidates my logic. Maybe there could be some vector with biannual periodicity.