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What structural innovation did Leonardo da Vinci propose for ships to improve protection against hull damage?
Answer
Double hull
What simple machine did Leonardo da Vinci study and popularize through designs using rotating balls between surfaces?
Answer
Ball bearing
What bird-inspired flying-machine concept did Leonardo da Vinci design with wings moved by human muscle?
Answer
Ornithopter
What is the name of Leonardo da Vinci’s four-wheeled machine often called the first self-propelled vehicle?
Answer
Leonardo’s self-propelled cart
What water-raising machine did Leonardo da Vinci design using a spiral screw inside a cylinder?
Answer
Archimedes' screw
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What is the name of Leonardo da Vinci’s four-wheeled machine often called the first self-propelled vehicle?
Answer
Leonardo’s self-propelled cart
What water-raising machine did Leonardo da Vinci design using a spiral screw inside a cylinder?
Answer
Archimedes' screw
What Leonardo da Vinci design is widely known as the first practical parachute concept?
Answer
Pyramidal parachute
Which Shanghai stock-market index reached its 2015 bubble peak on June 12 before China’s crash?
Answer
Shanghai Composite
What was the name of the 1962 U.S. stock-market decline caused partly by fears over steel-price increases?
Answer
Kennedy Slide of 1962