Inventions When was the toothbrush invented? 1770 1765 1742 1790 1770 1765 1742 1790 ANSWER DOWNLOAD EXAMIANS APP
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 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 ANSWER DOWNLOAD EXAMIANS APP
Inventions CORN FLAKES - Who made them first? Kellogg Nabisco Archers Quaker Kellogg Nabisco Archers Quaker ANSWER DOWNLOAD EXAMIANS APP
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 James B. Conant Robert Oppenheimer Leslie R. Groves Vannevar Bush ANSWER DOWNLOAD EXAMIANS APP
Inventions In which decade were the first successful diode and triode vacuum tubes invented? 1800s 1880s 1900s 1890s 1800s 1880s 1900s 1890s ANSWER DOWNLOAD EXAMIANS APP
Inventions What toy was invented by Joshua Lionel Cowen around 1900? Raggedy Ann doll Yo-yo Electric train Tinkertoys Raggedy Ann doll Yo-yo Electric train Tinkertoys ANSWER DOWNLOAD EXAMIANS APP
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