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Okay, Science Trivia Corner. And for any of you joining us tonight or even just listening in, if you're unfamiliar with this part of my net, there's a two-parter. One is a quiz and the other is just some straight trivia. And the quiz, well, it really isn't a quiz. It sounds contradictory. But the best way I put it each week is a trivia that's not just a question, just to make it appear a little bit more fun. So it's not a test, so don't worry about being right or wrong or anything like that. It's just a little bit of fun. We had to provide some interesting trivia. The first one here, and one, two, three, actually there's four, five. There's five quiz questions I think. I'm not sure I'll turn the fifth one into a trivia question or a quiz question. I'll wait while I get down there. The first one, have you ever seen pictures of atom bomb explosions, the test explosions? And even if you do a search now on your computer and you look, you'll often see there's a number of little rope-like filaments off to the side of the atomic explosion as the mushroom cloud is going up. You see all these squiggly little lines reaching up to the sky and reaching down on the ground. And what are they?