What causes nuclear winter? A nuclear winter is caused by soot, ash, and other particles being kicked up into the atmosphere by a nuclear war. These particles block out sunlight, and the temperature on the surface of Earth would be drastically reduced. A nuclear winter caused by nuclear weapons has thankfully never happened. We have
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Did Wyatt Earp have the law on his side at the OK Corral? A lot of people at the time might have disagreed, but Wyatt Earp acted legally during the Gunfight at the OK Corral. The Gunfight at the O.K. Corral happened on October 26, 1881, in Tombstone, Arizona. Wyatt Earp, his brothers Virgil and
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Was the Iron Maiden ever actually used? Despite its terrifying reputation, there is no credible evidence that the iron maiden was used as a medieval torture device. The familiar spiked cabinet appears to have been invented much later, during the 19th century. The iron maiden is probably one of the most famous medieval torture devices
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Why do some chemical reactions give off heat and others don’t? The answer depends on the amount of energy absorbed when chemical bonds are broken compared with the amount released when new bonds are formed. There are two types of chemical reactions: endothermic and exothermic. Endothermic reactions are those that require energy, and exothermic reactions
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What is Göbekli Tepe? Göbekli Tepe is one of the world’s oldest temples and megalithic sites. It was built in roughly 9500 BC, over eleven thousand years ago. It is in the south of the modern country of Turkey, not far from the border with Syria. It is the first human-built holy place in the
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Why are lemons sour when other fruits are sweet? Lemons are sour because they contain a lot of citric acid. We also need to remember that there are a huge variety of lemons, some very sour and some not so much. We need to break this question down into a few parts. Why does citric
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How did we discover stem cells? Stem cell were discovered by accident in the 1960s by James Till ad Ernest McCulloch. Despite the enormity of the discovery, they never won a Nobel Prize for it. Most cells in our bodies have a specific job. Skin cells, nerve cells, and liver cells all perform different functions.
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Why do spacesuits pick up so much static electricity on the Moon? Static electricity builds up on spacesuits for some of the same reasons it builds up on our clothes on Earth. As astronauts walk and move, their suits rub against other materials, allowing electrical charges to build up. However, conditions on the Moon make
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Why did the USA invade Canada in 1812? The United States invaded Canada as part of its war against Britain. Some Americans hoped to make Canada part of the United States, while others believed that conquering it would force Britain to negotiate. Either way, they expected a much easier victory than they actually achieved. In
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Why are some elements rarer than others? Some elements are rarer than others because lighter elements are easier to make, and heavier elements require a huge amount of energy. Also, elements with even atomic numbers are more common than those with odd numbers. And some elements are destroyed inside stars. This is an interesting question
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