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By Matt Tweed What makes a quark? How many quarks make a proton? How many protons make an oxygen atom? How many oxygen atoms make a carbon dioxide molecule? How many carbon atoms make you? In this accessible pocket book, packed with helpful diagrams and fascinating information, science writer Matt Tweed takes us on a whirlwind tour into the tiny realms, the stuff we are all made of, the building blocks of the material world—the elements of chemistry.