friction

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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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Flags of the countries of the world (flagpoles).

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Statue of Nostradamus

Nostradamus and His Prophecies

Vietnam War. U.S. President Lyndon B. Johnson awards the Distinguished Service Cross to First Lieutenant Marty A. Hammer, during a visit to military personnel, Cam Ranh Bay, South Vietnam, October 26, 1966. President Johnson

Vietnam War Timeline

Polar bear leaping among ice floes at Spitsbergen, Svalbard archipelago, Norway, the Arctic. Sea ice climate change mammal jump global warming

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Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

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.

Timeline of the American Civil Rights Movement

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kinetic friction stick-slip friction internal friction static friction coefficient of friction rolling friction wear dry damping viscosity matter chemical bonding nuclear fission catalysis nuclear fusion lubrication deformation and flow work absorption adsorption dispersion

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Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.

Physics and Natural Law

Italian physicist Guglielmo Marconi at work in the wireless room of his yacht Electra, c. 1920.

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