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The Mysteries of Optic Flow

2m 58s
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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Five Dogs With Crazy Résumés

2m 58s
Why do some dogs have short fur, others long tails, and still others wrinkly faces? Many dogs were bred to perform a specific tasks--from hunting vermin to wrangling bulls--and their physical characteristics were chosen to help them do their jobs.
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Why Sharks Attack Preview

30s / TV-PG

In recent years, an unusual spate of deadly shark attacks has gripped Australia, resulting in five deaths in ten months. At the same time, great white sharks have begun appearing in growing numbers off the beaches of Cape Cod, Massachusetts, not far from the waters where Steven Spielberg filmed the ultimate shark fright film, Jaws.

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Great Cathedral Mystery Preview

30s
The dome that crowns Florence’s great cathedral of Santa Maria del Fiore—the Duomo—is a towering masterpiece of Renaissance ingenuity and an enduring source of mystery. Still the largest masonry dome on earth after more than six centuries, it is taller than the Statue of Liberty and weighs as much as an average cruise ship.
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