How does cling film stick? Cling film (also called plastic wrap, saran wrap, cling wrap, and food wrap) sticks to surfaces because of static electricity and because of the properties of the plastic it is made of. Cling film (Saran wrap) is another of those products that we can’t live without, but which were discovered […]
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Why do geysers form? Geysers form where the groundwater is heated by geothermal vents until it boils. This steam builds up until the pressure is too great and it erupts out through weak points in the rock. The word geyser comes from the name of a geyser in Iceland back in 1780. It was called
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How do bats use echolocation? Echolocation works on the same principle as sonar in a submarine, but bats have special adaptations to be able to use it. The principle behind echolocation and sonar is that you send a sound wave out and then measure how long it takes to come back to you and the
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How do fires regenerate forests? Fires can regenerate a forest because they clear the thick canopy, they release nutrients into the soil, and they can trigger the dispersal of seeds from a lot of trees. As forests grow, they naturally get thicker and taller. Trees need sunlight and leaves to photosynthesize. If a tree cannot
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Why do some sand dunes sing? Sand dunes sing because the grains of sand slide down their sides and make vibrations that become sound waves. Sand dunes can form anywhere with sand, but the really large ones are more common in deserts. Different types of sand can make different dunes, but they are formed in
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Why can’t we see the far side of the universe? We can’t see the other side of the universe because there hasn’t been enough time since the beginning of the universe for that light to reach us, and the universe is expanding faster than the light can travel. The first reason we can’t see the
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How does artificial flavoring work? Artificial flavorings work by replicating the natural chemicals in foods that our taste buds detect. Before we look at how artificial flavoring works, we need to look at how we taste. We taste in the same way that we see, hear, and smell. We take physical things from the world
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What causes a heat island? A heat island is caused by cities because they absorb more heat and produce more heat than rural areas. Heat islands are more commonly known as urban heat islands because they happen in urban areas. Before we look at what causes them, let’s look at urban areas themselves. The first
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How does insect repellent work? Insect repellents work by either preventing the insect from detecting the signals given off by people or by using chemicals that insects don’t like. Insect repellents don’t have to repel all insects. They are generally designed to repel those insects that bite us. These are mostly mosquitoes, midges, ticks, and
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Why don’t things stick to Teflon? Things don’t stick to Teflon because the bonds between the atoms in Teflon are so strong that nothing else can stick to them. Teflon is actually a plastic, not a metal. Its chemical name is polytetrafluoroethylene (PTFE). Teflon is a brand name, which is why it is always written
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