Why do we see faces in everything? We see faces in everything because it is far better to think there is a face in the forest and be wrong than to not think there is a face there and be eaten by a tiger. Seeing faces everywhere is called pareidolia. This is Greek. “Para” means […]
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Why do your ears hurt on a plane? Your ears hurt on a plane because the pressure in the cabin is different to the pressure in the fluid in your inner ear, which causes pain. If you have ever ridden on an airplane, you have probably felt your ears go funny. You have probably also
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Why does copper kill bacteria? Copper can kill bacteria by pulling electrons away from the bacteria’s cell wall, breaking it. There are several materials and chemicals that are good at killing bacteria. Of all the metals, only copper, silver, and zinc can kill bacteria. Some plastics have been engineered to kill bacteria and there are
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Why do cold batteries lose their charge? Cold batteries don’t lose their charge exactly. In colder weather, the atoms that are inside the batteries can’t move as much and that means they can’t produce as much power. You may have noticed that if you use your phone on a particularly cold day, it runs out
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What is Prince Rupert’s drop? Prince Rupert’s drop is a small, tadpole-shaped glass bead that is incredibly strong but incredibly fragile. Prince Rupert’s drops have been around for a long time and there is some thought that they were first discovered by Roman glassmakers two thousand years ago. They were first brought to Great Britain
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How does roasting coffee beans change their flavor? Roasting the coffee beans changes their flavor because they lose a lot of water and they start to caramelize. When you buy coffee in a shop, you will most likely be buying roasted beans. You can buy unroasted coffee beans, but you have to seek them out.
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Why do we work Monday to Friday? We work Monday to Friday with Saturday and Sunday off because of trade unions and because of Henry Ford, but he was improving on systems that had started earlier in the previous century. The idea of having Saturday and Sunday as a holiday is a relatively recent invention.
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What are the physics of roller coasters? Designers of roller coasters have to pay a lot of attention to physics because they need the roller coaster cars to move, they need them to stay on the tracks, and they need them to go fast enough to be thrilling but not so fast that they kill
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How do bone conduction headphones work? Bone conduction headphones send sound waves through the bones of your skull into your inner ear without using the eardrum. Our ear is made up of several parts. The outer part is the bit that you can see and it is called the pinna. It is shaped to direct
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Why did the samurai class end? The samurai class were eliminated during the Meiji Restoration when Japan modernized in a very short period of time. Although, most of them just changed roles, rather than disappearing. The samurai came out of a military class that had been formed in the Heian Period, 710 to 1185. Heian
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