What is forensic facial reconstruction? It is the attempt to recreate the face of someone from just their skull. There are several reasons why it might be necessary to try to work out what a person might have looked like from just their skull. One obvious reason is in criminal cases. If an unknown skeleton […]
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Why do birds need to see ultraviolet light? It helps them with foraging, navigation, and signaling to each other. We can only see combinations of three colors: red, green, and blue. We have cones that detect these colors in our eyes. Most birds can also see ultraviolet light. They have four types of cones in
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Why did prehistoric insects grow so big? Because there was a lot more oxygen in the atmosphere and there were no birds. The largest insect in the world today is the Phryganistria chinensis, which is a stick insect. It is 64 cm long. The insect with the largest wingspan is the White witch moth, which
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Do antibiotics kill all of the bacteria in the body? Yes, they do. Antibiotics kill bacteria in the body. They do not work on viruses. We use bacteria when we have an infection and they can be very effective. An infection is caused when we have a wound and bacteria get inside. This is very
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Do cows only eat grass? Wild cows and cows that graze on pasture eat a lot of grass, but they also eat other plants as well. Cows that are kept in dairy farms are often fed a lot of grain and soy. There are not many wild cows in the world. In most developed countries,
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Why are some people lactose intolerant? Because their body doesn’t make enough of an enzyme called lactase. Milk is a liquid produced in the mammary glands of most mammals. It is made of 87% water with the remainder made up mostly of fat, protein, carbohydrates, vitamins, and minerals. The proteins act as an emulsifier because
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How do weight loss drugs work? They either reduce the appetite, reduce the absorption of nutrients, or increase the amount of fat that the body burns. Obesity is becoming a worldwide problem these days. It used to be only affluent countries that suffered from it, but now there are not many countries that are unaffected.
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How do our organs stay where they are when we stand up? Pieces of tissue called fascia hold our organs in place, along with a membrane called the serous membrane. I need to define this question a little more succinctly because organ has a surprisingly broad definition. The Oxford English Dictionary defines “organ” as “a
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How can opera singers sing so loud? By training their diaphragm, their lungs, using their mouths to amplify the sound as much as possible, and adjusting the frequency of the sound they are making. Opera singers are louder than the average person, but they also have a way of making their voices easier to hear,
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How did a pterodactyl fly? By jumping 2.5 meters into the air and then flapping. These days, we use pterodactyl to refer to any of the flying dinosaurs that looked similar, but pterodactyl is only one species. The family is called pterosaur. In Greek, “pteron” means winged and “sauros” means lizard. Pterodactyl comes from “pteron”
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