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    JUST WATCHED

    CNN10 - 03/02/17

MUST WATCH

CNN10 - 03/02/17

Now playing: The science behind tornadoes, an outbreak of bird flu in humans, efforts to fight modern-day slavery, and the development of self-driving racecars.

CNN10 - 03/02/17

Now playing: The science behind tornadoes, an outbreak of bird flu in humans, efforts to fight modern-day slavery, and the development of self-driving racecars.