Look Up! The Billion-Bug Highway You Can't See

Robert Krulwich reveals the invisible highway of billions of tiny insects riding the wind right above our heads.

A delightful animated science lesson that will make you look at the sky differently.

Look up at the sky and what do you see? Well, blue, yes. And maybe a plane or a bird, but otherwise ... nothing. Or so you think. It turns out that right above you, totally invisible, is an enormous herd of animal life -

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