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So can I get a show of hands
how many of you in this room

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have been on a plane
in this past year?

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That's pretty good.

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Well, it turns out that
you share that experience

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with more than 3 billion people
every year.

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And when we put so many
people in these metal tubes

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that fly all over the world,

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sometimes, things like this
can happen

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and you get a disease epidemic.

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I first actually got into this topic

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when I heard about 
the Ebola outbreak last year.

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And it turns out that although Ebola
spreads through

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these more