Are plexiglass and fiberglass actually glass? Plexiglass is a type of plastic and not real glass, but fiberglass has glass fibers in it. Let’s look at plexiglass first. Plexiglass is a registered trademark because it is the name of a product. It was originally written in all capitals as PLEXIGLASS®. It was invented by a […]
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What is a bookworm? A bookworm is any number of insects, or the larvae of insects, that eat books. They are not actually worms. Why would an insect eat a book? What food is there in a book? Some insects don’t actually eat the books, but fungi and mold that grow on the pages of
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What is the difference between AM and FM radio? The radio waves are moderated differently. AM radio waves are Amplitude Modulated and FM radio waves are Frequency Modulated. First, we need to look at how a radio broadcasts a signal. The radio has three jobs. It has to take the voice or music that is
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What is a hernia? There are different types of hernia in different parts of the body, but they are all caused by something pushing through a tear in a muscle. The hint to what it is is in the name. The word hernia comes from the Latin “hernia”, which means “rupture”. There are technically 9
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Are elephants the only source of ivory? No. Ivory comes from many other animals, besides elephants. It is also possible to make synthetic ivory. Ivory is a hard, white substance that forms the teeth and tusks of a lot of animals. It is made of dentine, which is a form of bone. The inside of
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Why does walking become harder as we get older? It is a combination of age-related factors, such as stiff joints, brittle bones, lack of balance, deteriorating muscles, shortening ligaments, deteriorating nerves, and even neurological factors. As we age, our bodies start to deteriorate and that results in a changed way of walking. That is unavoidable,
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Why is the black market called the “black” market? This type of market has existed for as long as there has been trade, but the name “black market” appears to have become common after World War 2 and it is probably only called black because it is a shadow, or hidden market. A black market
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Is there a land speed record limit? Because of physics and current technology there is, but no one knows exactly what that limit is. The current land speed record was achieved in 1997 and it is 1,223.657 km/h (760.343 mph). It was broken by a team driving a car called Thrust SuperSonic Car and the
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What are kosher and halal food? Kosher food is food that has been prepared according to Jewish law and Halal food is food that has been prepared according to Islamic law. The word “kosher” is a Hebrew word and it means “fit” or “proper”. Jewish people, if they stick to the rules, can only eat
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What was Antarctica like before the snow? Before it froze, Antarctica was a tropical forest with large trees and a lot of wildlife. First, we need to settle the difference between the Antarctic and the Arctic. It can be difficult to remember which is which, at least for me. It gets easier when you learn
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