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The original post: /r/todayilearned by /u/f_GOD on 2025-01-21 05:23:57.

Original Title: TIL frogs can see individual photons, the smallest possible particles of light. Even the faintest sources like distant stars appear as individual points of light not as a continuous stream but as separate flashes. To test it single photons were fired at photoreceptor cells triggering a nerve impulse