This is the bust of...
This is the bust of Louis Braille, a French educator and inventor of a system of reading and writing for use by the blind or visually impaired. His system remains virtually unchanged to this day, and is known worldwide simply as braille.
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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