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Here's the clip on Youtube:
http://youtube.com/watch?v=9ACobXN7_p8
It's pretty nuts that she doesn't know, but she brings up a good point. Knowing whether the world is flat or round is a useless fact and unnecessary in everyday life.
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There are lots of facts that are not needed in everyday life that are still widely known. The lack of practical use isn't an excuse for not knowing something any idiot would know.