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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.
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Adolf Hitler (Nazi, nazism, German leader).
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Mona Lisa, oil on wood panel by Leonardo da Vinci, c. 1503-06; in the Louvre, Paris, France. 77 x 53 cm.
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technological innovation

Learn about this topic in these articles:

work of Romer

  • Romer, Paul
    In Paul Romer

    …growth and its relation to technological innovation. Romer’s work shed light on the ways in which technological advances that help sustain economic growth are generated in human economic activities and showed that persistent growth requires government intervention in the form of investment in research and development (R & D) and…

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