Even if we didn't see sunlight,our bodies would still have a 24 hour circadian rhythm

Amazing and weird fact about Zeitgeber: 

Did you know? Even if we didn't see sunlight,our bodies would still have a 24 hour circadian rhythm.We would sense Zeitgebers, things that regularly happen in the course of 1 day, like temperature fluctuations or even our morning coffee and latch itself onto them.It's how blind people's bodies count hours.

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