How worried should we be about bird flu?

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The new strain of bird flu has infected more than 90 million chickens and has spread to dairy cows and even humans. Here's what you need to know about the "global pandemic for animals."

A man thought his hip hurt because he'd ran a marathon. He was diagnosed with prostate cancer that had spread to his bones.

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Marathon runners
The man (not pictured) tried many treatments but his pain got worse.

Ghislain & Marie David de Lossy/Getty Images

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