When was the first machine gun patented?
On May 15, 1718, Englishman James Puckle patented his machine gun, the world's first! You may have thought the Gatling gun or the Maxim machine gun was the first machine gun, but depending on how you define “machine gun” James Puckle, Esq. (yes, he was a lawyer) got there first.
Answers by country
the United States
What was the main weakness of Colt revolvers, comparing to its competitors?
lack of possibility to use metallic cartridges
poor shooting precision
Who invented the mercury-in-glass thermometer?
Gabriel Daniel Fahrenheit
Who created the QWERTY keyboard layout?
Christopher Latham Sholes
Thomas Alva Edison