History

#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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#1493 What were penny auctions?

What were penny auctions? Penny auctions were a way for communities to stop farms and properties being sold by the banks that foreclosed on them during the Great Depression. The 1920s and the 1930s were a hard time for a lot of Americans. The Great Depression began in 1929, which destroyed the life savings of

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#1492 How did Bubble Wrap start?

How did Bubble Wrap start? Bubble Wrap began as a type of wallpaper. We see Bubble Wrap fairly often, probably more so since Amazon has taken over our shopping. Bubble Wrap is actually a trademarked brand, and it is owned by Sealed Air Corporation, although it has become somewhat like Kleenex, Aspirin, and Kerosene, in

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