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        6-12

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        Part of It's Okay To Be Smart
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        Ghosts of Evolution | It's Okay to Be Smart

        Every fall, in cities like New York, the smell of vomit fills the crisp air. The culprit? The pungent seeds of the ginkgo biloba tree. So why would a tree evolve such a disgusting and revolting way to disperse its genes and make baby trees? Join Joe Hanson, host of It's Okay to Be Smart, for an evolutionary ghost story.

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