What instrument did Leonardo da Vinci design that used keys to bow strings continuously?
Answer
Viola organista
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What instrument did Leonardo da Vinci design that used keys to bow strings continuously?
Answer
Viola organista
What ball-bearing component did Leonardo da Vinci sketch to reduce friction between moving surfaces?
Answer
Ball bearing
What wheeled machine did Leonardo da Vinci design to move automatically using wound springs?
Answer
Self-propelled cart
What armored vehicle did Leonardo da Vinci sketch around 1487 for military use?
Answer
Armored tank
What mechanical figure did Leonardo da Vinci design in armor for court entertainment?
Answer
Robot knight
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What wheeled machine did Leonardo da Vinci design to move automatically using wound springs?
Answer
Self-propelled cart
What armored vehicle did Leonardo da Vinci sketch around 1487 for military use?
Answer
Armored tank
What escape device did Leonardo da Vinci sketch in 1485 for a person jumping from a height?
Answer
Pyramidal parachute
What was Leonardo da Vinci’s corkscrew-like flying-machine concept called?
Answer
Aerial screw
On what date did the Thirteenth Amendment receive the ratification needed to abolish slavery?
Answer
December 6, 1865
What building hosted the 1787 Constitutional Convention in Philadelphia?
Answer
Independence Hall