In the tropics, fireflies get startled by lightning storms and that kind of pre-synchronizes them all as they respond in shock to that lightning bolt. The prevailing view today is that it's done. This spontaneous synchronization is an emergent phenomenon that it, as you say, itself organizes. You don't need an external signal like lightning in the jungle. So anyway, but there were like I say, there was a very old problem, and it was only by around the 1960s that those experiments that I mentioned with pen flashlights demonstrated that these fireflies are both reacting to flashes as well as emitting them.

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