Stephanie Kwolek prepares a polymerization experiment at DuPont's Pioneering Research Lab in 1967. Kwolek, who died Wednesday, made the breakthrough discovery that led to the invention of Kevlar. DuPont hide caption

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Horace Silver performs for television in Copenhagen, Denmark, in 1979. JazzSign/Lebrecht Music & Arts/Corbis hide caption

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Charles Barsotti created more than a thousand cartoons for the New Yorker, many of which featured a series of round-snouted dogs just like this hapless pair. Charles Barsotti/ Courtesy of the New Yorker hide caption

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