Who invented the stethoscope?

David Littmann

René Laennec

Arthur Leared

Golding Bird

René Laennec was a French physician who invented the stethoscope in 1816, and pioneered its use in diagnosing various chest conditions. He also coined the term melanoma, and developed the understanding of peritonitis and cirrhosis.

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What was the main weakness of Colt revolvers, comparing to its competitors?

low speed

low durability

lack of possibility to use metallic cartridges

poor shooting precision

Who invented the mercury-in-glass thermometer?

Galileo Galilei

Anders Celsius

Gabriel Daniel Fahrenheit

William Kelvin

Who created the QWERTY keyboard layout?

Christopher Latham Sholes

Jan Szczepanik

Thomas Alva Edison

Dag Hammarskjöld

Who coordinated the mass deportation of Jewry during the Holocaust?