eli5, why do deer run at the slightest sound or movement, but just stand there and stare when a car is coming towards them at full speed?
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Experiment: Wait until midnight. Let your eyes get well adjusted to the dark. Then, run through a forest of trees.
Shine a bright light into your face and stare at it for a few seconds. Run through the forest of trees again.
You will soon discover why deer stop running and stand in the middle of the road after shining bright lights into their eyes.
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