Case file · High strangeness
Synchronous fireflies of Elkmont
Each June, fireflies at Elkmont in the Great Smoky Mountains flash in unison. Locals long took it for granted; scientists only documented it after Lynn Faust wrote to them in 1993.
1993 CE · 35.66, -83.58 · status: explained
The account
The species, Photinus carolinus, is one of very few in the Americas known to synchronise. The display now needs a lottery for parking.