What causes traffic jams? The biggest cause of traffic jams is obviously the volume of traffic, but, in order of importance, they are caused by bottlenecks, traffic incidents, bad weather, road construction, poor signal timing, and other factors. Obviously, the main cause of traffic congestion, irrespective of the other reasons, is the volume of traffic […]
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Why do we forget names but not faces? We forget names but not faces because our brains have evolved to give more weight to visual information than to arbitrary labels. We have a powerful brain network for recognizing faces, but names have to be attached to those faces separately, and that connection is often much
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Who invented the shopping mall? The shopping mall was invented by an Austrian architect called Victor Gruen in the 1950s. Shopping malls are sprawling labyrinths of shops and restaurants that spread out over an enormous area. They are usually out of town and are surrounded by even more enormous car parks to accommodate the masses
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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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Why do house doors open inwards but public doors open outwards? House doors generally open inwards for security and public doors generally open outwards for safety. The majority of front doors open inwards for security. The main purpose of a front door is to keep people and things out of your houses. With a door,
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Why do opposite sides of the brain control opposite sides of the body? Nobody actually knows the real reason why the left side of our brain controls a lot of the functions on the right side of our body, and the right side of the brain controls a lot of the functions on the left
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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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