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Which Dragon joined the British show Dragon's Den in 2006 and became known for her property and leisure businesses?
Answer
Deborah Meaden
How many Dragons made up the original investor panel of the British Dragon's Den?
Answer
Five
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
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What instrument did Leonardo da Vinci design that used keys to bow strings continuously?
Answer
Viola organista
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