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This is an artist's imaginative rendering of an atom, but quantum mechanics makes it hard to imagine exactly what an atom is. Richard Graham Farmer/Science Photo Library/Corbis hide caption

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Richard Graham Farmer/Science Photo Library/Corbis
Franck Camhi/iStockphoto

Why Doesn't Your Butt Fall Through The Chair?

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This visualization shows the electron density in a quantum dot, an artificial atom. Wei Qiao, David Ebert, Marek Korkusinski, Gerhard Klimeck/NCN, Purdue University hide caption

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Wei Qiao, David Ebert, Marek Korkusinski, Gerhard Klimeck/NCN, Purdue University