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What friction-reducing machine element did Leonardo da Vinci sketch using balls inside a cage?
Answer
Ball bearing
What aerial safety device did Leonardo da Vinci sketch in 1485, centuries before modern parachutes?
Answer
Parachute
What water-control mechanism did Leonardo da Vinci design to regulate canals and rivers?
Answer
Sluice gate
What instrument did Leonardo da Vinci design around 1488 to measure wind speed?
Answer
Anemometer
What self-propelled vehicle did Leonardo da Vinci sketch around 1478–1480, centuries before automobiles?
Answer
Self-propelled cart
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What self-propelled vehicle did Leonardo da Vinci sketch around 1478–1480, centuries before automobiles?
Answer
Self-propelled cart
What type of mechanical figure did Leonardo da Vinci design in 1495?
Answer
Humanoid robot