Take Two

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The Atlantic lists the 50 greatest tech breakthroughs of all time

by Take Two

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Sir Alexander Fleming (1881 - 1955), discoverer of penicillin, studies mould cultures in his laboratory at the Wright Fleming Institute in London. Fleming also developed a technique of 'painting' pictures with germs, drawing outlines on small pieces of paper, which would grow into a picture as the microbes multiplied. Peter Purdy/Getty Images
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