What is the opposite of white? Either black or transparent. Let’s look at what colors are, what white is, and what black and transparent are. Colors appear when an object reflects a certain wavelength of light. Light is energy that is flying through space, called electromagnetic radiation. There are many different types of light and […]
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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 does popcorn pop? Pressure builds up as the water in the kernel heats up until it explodes. People have been eating popcorn for thousands of years. Archaeological evidence of popcorn from Peru in 4700 BC has been found. Corn, which is more commonly known as maize, was domesticated about 10,000 years ago but modern
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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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What is a central bank? It is an institution that manages the currency of a country and controls the supply of money. Nearly every country has a central bank. It is sometimes called a reserve bank. There are nine countries that don’t have one. They are Andorra, Isle of Man, Kiribati, Marshall Islands, Micronesia, Monaco,
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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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Could penguins fly in the past? Yes, they could, but millions of years ago. There are many birds that could fly at some point but that have lost the ability. The Galapagos Cormorant is a good example. They are only found on two of the Galapagos islands. They are not originally from the island, so
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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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Why do dragonflies have four wings? So that they can hover and fly in any direction that they wish. Most insects have two pairs of wings but the second set in some of them have evolved to have a different purpose. Two examples of these are flies and beetles. (I know we are talking about
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