Do flying fish really fly? No, flying fish don’t really fly, but they can glide through the air for some considerable distance. Flying fish are sometimes known as flying cod, but they are not cod. When cooked, they are said to taste like cod, which could be where the nickname comes from. They are a […]
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How does an X-ray machine make an image？ An X-ray makes an image because some parts of the body absorb X-ray radiation and some parts of the body don’t. Bones absorb the majority of it and appear white. X-rays are a type of electromagnetic radiation with a wavelength between 10 nanometers and 10 picometers. There
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What is a kelp forest? A kelp forest is a dense area of kelp in the sea. Kelp is a type of algae. They form incredibly diverse ecosystems, and they can help to clean up the sea. Kelp are giant strands of brown algae, probably more commonly known as seaweed. They look like plants, but
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How do seedless fruit reproduce? Seedless fruit don’t produce viable seeds, so they can’t reproduce, but they don’t need to because they are produced by breeding two different plants that can produce fruit with seeds. These days, we can buy fruit with seeds, and we can usually buy seedless varieties of fruit as well. Watermelon
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Why does coral bleaching occur? Coral bleaching primarily occurs because heat stress causes the coral to expel the algae that give them their beautiful colors. If you go diving in a tropical region, you will probably see enormous numbers of coral. They should be a whole range of beautiful colors, but these days, enormous numbers
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What is the honeybee waggle dance? Honeybees do a waggle dance to communicate the distance and the direction away from the hive of a patch of flowers. It demonstrates that bees can remember information, communicate that information, and that other bees can understand it. It is a fairly complex type of communication. When you think
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What causes a hangover? A hangover is caused by a combination of things, including acetaldehyde poisoning, dehydration, inflammation, irritation of the stomach, low blood sugar, and lack of sleep. As an interesting aside, the word “hangover” only became associated with the morning after drinking too much in 1904. It was used in the Foolish Dictionary,
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What are blisters and calluses? A blister is a pocket of body fluid that has formed between the outer layers of skin in response to damage. A callus is an area of thickened skin that has been formed to protect the skin from damage. The word “blister” came into English from the old French “blestre”,
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Why are your fingers stiff when you are cold? Fingers are stiff when you are cold because the body moves the blood to more important organs, because muscles stiffen in the cold, because the joints become viscous, and because the cold can reduce nerve impulses. When our hands are exposed to the cold for a
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Why do onions have so many layers? Onions have so many layers because each layer is a modified leaf that has grown from the center out. When they are first planted, onions grow from a seed. These seeds are produced by flowers at the top of the onion’s stalk. If you think about an onion
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