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Science
there are 100 illustrated topic panels on science and each panel contains 10 key facts. Facts like these:rn* The internet began in the 1960s when the US Army developed a network called ARPAnet to link computers.rn* One kilogram of deuterium (a kind of hydrogen) can give the same amount of energy as three million kilograms of coal.rnNow discover the other 998 facts in 1000 Things You Should Know About Science
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