Why did it take so long to invent the wheel? It took so long to invent the wheel because a wheel is not as intuitive as we might think. It is probably safe to say that modern life would not function without the wheel. Wheels are everywhere, even down to tiny wheels inside the devices […]
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How do plants grow towards light? Plants grow towards light using a process called phototropism, which is driven by a hormone called auxin. Plants photosynthesize, which obviously requires sunlight. They need to be able to grow towards sunlight in order to photosynthesize as much as possible. To do this, they grow more on the side
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Why do we get altitude sickness? I want to say that we get altitude sickness because we are too high up. More specifically, altitude sickness happens because the body cannot get enough oxygen at high altitude. It is more likely the higher we go, but it depends a lot on the individual. Some people get
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Why does friction produce heat? Friction produces heat because mechanical energy has to go somewhere, and some of it is converted into the random movement of atoms and molecules, which is heat. Sometimes we need friction to produce heat and sometimes we don’t want it to. If you have ever been out in the cold
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When did tax start? The earliest evidence of taxation comes from Mesopotamia and Ancient Egypt in roughly 3300 to 3000 BC. This was long before people paid tax in coins, so tax was usually paid in goods or in labor. Some form of taxation probably existed before the earliest evidence we have, but writing was
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Who was Mrs. Beeton? Mrs. Beeton was Isabella Beeton. If you are British, you have probably heard her name in reference to all of the household management and recipe books that were released in her name. Even if you are not British, there is a strong chance that you have heard of her. I say
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What was the Mongol postal system? The Mongol postal system was called the Yam and it was extremely fast and reliable. The Mongol Empire was one of the largest empires in history and at its peak it covered 17.8% of the world’s land area. At its greatest extent, it spanned from the edge of Europe
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Why did Gilbert and Sullivan fall out? W. S. Gilbert and Arthur Sullivan fell out badly after Gilbert challenged a £500 carpet expense in 1890. The carpet is usually given as the cause of their breakup, but there were many other reasons, and the split had been building for a long time. You may never
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How do plant roots know where water is? Plant roots find water through a process called hydrotropism, which is where they can sense the moisture content of the soil. Not all plants have roots, but the majority do. Mosses and liverworts don’t have roots. They have tiny hairs that they use to hold themselves in
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Why does oil splash when cooking? Oil splashes when cooking because water in the food hits the hot oil and instantly vaporizes into steam. If you have ever dropped food into a frying pan and been sprayed with hot oil, you’lI understand this problem. It basically comes down to the heat of the oil, the
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