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Okay, gang, guess what were gonna talk about today . Begin with m, end with agnetism. Try that. Magnetism. Magnetism. See these paperclips . Yeah. I take the paperclips and i dump them out on the book. How come theyre on the book and not on the ceiling . Gravity. Gravity. The gravitational interaction between these paperclips and every molecule in the whole world pulling which way . Okay, down, right . Theres this earth and these mountains and everything, all pulled down, down, down, down. How about the clouds . Are they pulling up a little bit . The ceiling pulling up a little bit . How many say, oh, theres no gravitational interaction at all with the paperclips and the ceiling . Show of hands. How many say, theres a gravitational interaction between every pair of masses . Show of hands. Yeah, my people, all right. So how come the ceiling how come these things arent moving up to the ceiling . How many say, i dont be knowing that, gee, cause i suspect they should . Come on, gang, whats

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