Was there an intelligent civilization on Earth before us? There almost certainly was not an intelligent civilization on Earth before us. They would have left signs that could not be mistaken. The thought that an ancient civilization might have existed on Earth is called the Silurian hypothesis, named after such a species that exist in […]
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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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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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How did they find the Chicxulub crater? They found the Chicxulub crater, the remains of the asteroid that wiped out the dinosaurs, when they were looking for oil. The Chicxulub crater was made when an asteroid ten kilometers in diameter hit Earth. It landed just over 66 million years ago and left a crater that
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How does a TCAS system work? A TCAS system works by analyzing another aircraft’s position, altitude, and speed and working out if a collision is likely, before offering advice to both planes. TCAS stands for Traffic Collision Avoidance System, and it has been installed on most commercial aircraft since the 1980s. A need for such
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Why did the Titanic sink? The Titanic sank because of poor quality materials, problems with the design, the temperature of the water, and a lack of equipment for the crew. I’m sure you are all familiar with what happened to the Titanic. The Titanic was built in Britain, and she was an ocean liner owned
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When did a week get 7 days? People first used a 7-day week over 4,000 years ago in the Akkadian Empire. When we think about it, there is no logical reason why a week should have seven days. You cannot divide the year up into 7s. For a while, the French tried a ten day
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How does a thermometer work? A traditional thermometer works by knowing how much mercury will expand at different temperatures. An oven thermometer works by knowing how much a piece of metal will expand when heated. And a modern thermometer uses a thermistor, which has a different electrical resistance at different temperatures. The idea behind the
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What causes condensation? Condensation is caused by warm, moist air coming into contact with a cooler surface. Condensation happens in a house when the air in a room is warm and moist and then comes into contact with a cool surface. This often happens in winter when it is much colder outside and the heater
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How do CDs and cassettes record information? CDs record information by using pits and bumps, or by using burned colored dye. Cassettes record information by using charged magnetic tape. There are three types of CDs. There are the CDs you buy prerecorded from the shop, CDs that you burn yourself in your computer, and CDs
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