History

#1554 What happened to JFK’s sister?

What happened to JFK’s sister? JFK’s sister, Rosemary Kennedy, was permanently incapacitated by a failed lobotomy in 1941, leaving her with the mental age of a two-year-old. Rosemary Kennedy was the third of nine children born to Joseph P. Kennedy and his wife Rose Fitzgerald. They are known as the Kennedy family, and Rosemary was […]

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#1552 What was the gold standard?

What was the gold standard? The gold standard was a system that tied the value of a country’s currency to a fixed amount of gold. It is often said that it ended in 1971, because that was when the United States stopped converting dollars into gold for foreign governments and central banks, which was the

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#1499 What is a Stirling engine?

What is a Stirling engine? A Stirling engine is an engine that uses the expansion and contraction of a gas when heated and cooled to carry out mechanical work. A Stirling engine works on the principle that gases expand when heated and contract when cooled. When thermal energy is applied to a gas, the molecules

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