Why is PM 2.5 dangerous? They are particles that are too small for our nose to catch. PM stands for Particle Matter and they are microscopic solid or liquid particles that are small enough and light enough to be suspended in the air. There are many sources of these particles. In some countries, one of […]
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Why are diamonds so expensive? Because we believe they should be expensive, not because they are rare. We think that diamonds are expensive because they are rare, but they are not as rare as we think. Diamond is a structure made of carbon atoms that are arranged in a crystal structure. Diamond is one of
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How do fossils form? They form when the bones of an animal are turned to mineral. A fossil forms when an animal dies in water or falls into water. This water is more commonly an ocean or a lake because for a fossil to form, the sediment at the bottom of the water has to
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Do cyanide pills kill as quickly as in the movies? Perhaps. If it is the right kind of cyanide, it can kill in about 2 to 5 minutes. There are several different types of cyanides and they can be found in liquid, solid, or gas form. Cyanide is a group of chemicals that have a
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Can we cover the Sahara Desert in solar panels? Technically, yes. Practically, no. The Sahara Desert is the largest hot desert in the world. It covers 9.2 million km2, which would make it the fifth largest country in the world, if it were a country. It is one of the most exposed areas on Earth
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Why do we get hot when we exercise? Because heat is a byproduct of the process muscles use to make energy. Let’s look at how we get energy to our muscles. We are unable to make our own energy, we can only convert one energy source into another. We have to eat plants or animals
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Could a Formula One car drive upside down? Technically yes, but it might need some modifications. Formula One racing cars are some of the fastest cars in the world. The fastest speed ever reached in a Formula One car is 397.36 km/h. This is not as fast as the land speed world record, which is
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Why do some liquids burn and others don’t? Some liquids require less energy to get the chemical reaction over the activation energy barrier. What is fire? Fire is the process of combustion and is a chemical reaction. Fire needs three things to happen: a fuel source, heat, and oxygen. If you remove one of these,
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How do chemotherapy and radiotherapy work? Chemotherapy works by damaging the DNA inside the nucleus of the cancer cells and stopping them dividing. Radiotherapy works by targeting the cancer directly and damaging its DNA. How does cancer form? As our cells age, they die and new cells replace them. Some cells are replaced more quickly
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How does a pressure cooker work? By using high pressure to raise the boiling point of the water. Pressure cookers were invented in 1679 by a French physicist. He was trying to find a way to cook food faster. Cast iron pressure cookers were made in Germany in 1864. Pressure cookers improved through the early
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