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The Mysteries of Optic Flow

How do birds manage to fly through narrow spaces without constantly bumping into trees or buildings? It turns out that they use a trick of the eye called optic flow. Understanding what optic flow is and how birds use it could help us build a safer world for our feathered friends.
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As entertaining as it is informative, NOVA explores innovations and discoveries from the world of science and technology while highlighting the human side of science.

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