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Name the 20th-century scientist who discovered the brain's "conditioned reflex" by testing whether dogs would salivate when they heard a bell, regardless of whether or not food was present.
Russian physiologist Ivan Pavlov
American psychologist B. F. Skinner
German psychiatrist Frieda Fromm-Reichmann
American psychologist John Watson

Answer: Russian physiologist Ivan Pavlov


When was the world's first video game invented?
1963
1938
1958
1969

Answer: 1958. The game, developed at the Brookhaven National Laboratory in Long Island, N.Y., resembled a crude version of Pong.


How many AIDS cases had been diagnosed worldwide by 1982, one year after the disease was first discovered?
10,900
3 million
1,600
450,000

Answer: 1,600


In 1994, the comet called Shoemaker-Levy 9 pounded into a planet with a force estimated to be equal to that of all Earth's nuclear bombs and weapons. What planet did Shoemaker-Levy 9 attack?
Jupiter
Saturn
Mars
Pluto

Answer: Jupiter


What was the name of the first handheld camera?
The Brownie
The Twinkie
The Polaroid
The Cannon Sure-Shot

Answer: The Brownie



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