Neil Patrick Harris: How many people have had a flu shot this season? He says if there were a vaccine for Ebola, "wouldn't everybody want it?" It's not just protecting yourself, he says. If you can get a sufficiently large number of people immunized, an epidemic won't get going.,Harris writes.
Our evolutionary journey concludes with Neil deGrasse Tyson, Richard Dawkins, Bill Nye, Eugene Mirman, Jim Gaffigan and Maeve Higgins, recorded live at the Beacon Theatre in NYC.
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