Knights were indeed lower than vassals and held less prestige in medieval society. It's not true though, that knights didn't have enough prestige in medieval society. Vassals swore to the king or the ruler of a region, whereas knights often swore to vassals, so they still had people under them, but they were not at the top.
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confirmed that the earth revolves around the sun
created a powerful telescope
discovered moons orbiting Jupiter
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Born in 1863, Henry Ford was the first surviving son of William and Mary Ford, who owned a prosperous farm in Dearborn, Michigan. At 16, he left home for the nearby city of Detroit, where he found apprentice work as a machinist. He returned to Dearborn and work on the family farm after three years, but continued to operate and service steam engines and work occasional stints in Detroit factories. In 1888, he married Clara Bryant, who had grown up on a nearby farm.In the first several years of their marriage, Ford supported himself and his new wife by running a sawmill. In 1891, he returned with Clara to Detroit, where he was hired as an engineer for the Edison Illuminating Company. Rising quickly through the ranks, he was promoted to chief engineer two years later. Around the same time, Clara gave birth to the couple’s only son, Edsel Bryant Ford. On call 24 hours a day for his job at Edison, Ford spent his irregular hours on his efforts to build a gasoline-powered horseless carriage, or automobile. In 1896, he completed what he called the “Quadricycle,” which consisted of a light metal frame fitted with four bicycle wheels and powered by a two-cylinder, four-horsepower gasoline engine.
Answer:
D) He was the main author of the document
Explanation: