"At a time when President George Washington and Secretary of State Thomas Jefferson were discouraged and felt that their plans for a new capital of the country were doomed to failure, a black surveyor stepped forward and saved the situation."
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"Banneker spent the later years of his life in retirement on his farm, where he entertained many distinguished men of science and art."
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"Public acclaim was widespread. Rillieux had indeed revolutionized the sugar industry. "
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"The new machine not only greatly increased shoe production; it also cut the cost of shoes by half."
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"Lubrication is essential in machinery, because if the moving parts of the machine come into contact with one other, the machine will soon stop."
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"The object of Wood's invention was to produce a telephone transmitter with more distinct and powerful effect than had been possible at the time by the type...