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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Why do poppies make opium? Not all poppies do make opium, but the ones that do, make it to ward off pests. There are 775 different species of poppy, known as the Papaveraceae family. Most of them produce the milky latex that becomes opium in the opium poppy, but only the papaver somniferum is able
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What is truth serum? It is a drug that prevents people from censoring themselves so they reveal the truth. These drugs are usually barbiturates and there is no real proof that they work. People have searched for a drug that can help them get at the truth for thousands of years. The very first type
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What causes turbulence? It happens when an airplane flies through turbulent air (hence the word turbulence) and gets buffeted around. Turbulence can cause a plane to suddenly rise or fall hundreds of meters very quickly. It can also cause a lot of shaking, and it can cause some damage to the plane, but it very
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How does a Maglev train work? They use magnets to move the train forwards and to reduce friction. Maglev is the shortened form of magnetic levitation, and it is a train based on the principle of magnetic attraction and repulsion. We all know that when you have two magnets, the opposite poles attract each other
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Why does ice have so little friction? Because there is a very thin layer of water on top of the ice. Although, the reason for that is not completely understood. If a force is applied to an object it picks up kinetic energy. The kinetic energy is transferred from the energy used to make the
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Why are emulsifiers used in processed food? They help different compounds to combine, and they make foods less sticky and easier to eat. What are emulsifiers? Their basic job is to combine two compounds that wouldn’t normally be able to hold together. An obvious example is oil and water. If you tip olive oil into
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What are stalagmites and stalactites? They are deposits of minerals that form in caves. Stalactites hang down from the top of the cave and stalagmites rise up from the ground. To help you remember, stalactites have a “c” for ceiling and stalagmites have a “g” for ground. If you want another way to remember which
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What is CRISPR? It is a way of editing genes and it stands for Clustered Regularly Interspaced Short Palindromic Repeats. It works by separating the genes inside the DNA and inserting a mutation. To begin with, let’s look at what DNA and genes are. DNA is inside all of our cells and it holds the
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Why does time go forward not backward? Because of entropy. Entropy is the measure of how random and dispersed the energy and mass in a system are distributed. It is described by the Second Law of Thermodynamics, which says that the entropy of a closed system increases over time. The system has to be closed
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