Certain cicada species in North America emerge from the ground by the millions every 13 or 17 years. But why those specific intervals? Are cicadas secretly prime-number-loving mathematicians?!
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Sources:
https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1890/04-1175
https://academic.oup.com/aesa/article/104/3/443/22755
https://academic.oup.com/mbe/article/36/6/1187/5372347
https://www.pnas.org/content/110/17/6919
https://peerj.com/articles/5282/
https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1890/10-1583.1
https://www.jstor.org/stable/10.1086/668596?seq=1
https://www.jstor.org/stable/2463533?seq=1
https://www.smithsonianmag.com/science-nature/what-are-cicadas-180975009/
https://www.aimsciences.org/journals/displayArticlesnew.jsp?paperID=512
Images:
https://commons.wikimedia.org/wiki/File:Magicicada_septendecim_TPopp.jpg
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