Fireflies glowing above a stream, Okayama Prefecture, Japan  

Fireflies glowing above a stream, Okayama Prefecture, Japan

In Okayama Prefecture, when humid air settles over a stream, hotaru—Japan"s fireflies—begin signalling. On warm, windless evenings, they often start glowing about two hours after sunset under favourable conditions, inviting silence beside water.

© tdub303/Getty Images

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