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Inventions

Inventions
When was the toothbrush invented?

1770
1765
1742
1790

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Inventions
What inspired reflecting road lights to be invented?

Car door reflecting mirrors
The sun light on the windshield
Sun light on steel posts on road sides
The light a cat's eyes gave off on a fence

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Inventions
CORN FLAKES - Who made them first?

Kellogg
Nabisco
Archers
Quaker

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Inventions
The Manhattan Project was started by President Roosevelt in 1942 to ensure that the U.S. beat the Germans in developing a nuclear bomb. Whom did Roosevelt appoint as scientific head the Manhattan Project?

James B. Conant
Robert Oppenheimer
Leslie R. Groves
Vannevar Bush

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Inventions
In which decade were the first successful diode and triode vacuum tubes invented?

1800s
1880s
1900s
1890s

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Inventions
What toy was invented by Joshua Lionel Cowen around 1900?

Raggedy Ann doll
Yo-yo
Electric train
Tinkertoys

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