Are electric planes possible? Electric planes are possible, but not for long distances yet. Electric cars are a very common site on the road these days, and you would think electric planes would be the next step, but electric planes are much harder to make than we think. The main problem is the range they […]
#1125 Are electric planes possible? Read More »
Why do planes use halon fire extinguishers? Halon fire extinguishers are used on planes because they don’t conduct electricity, they don’t leave a residue, they put out the fire effectively, and they are not very toxic to people. There are many different types of fire extinguisher, but they all work on generally the same principle.
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Why does soap produce foam? All foaming soaps contain chemicals that are called foaming agents. As their name implies, their job is to make a foam when you add water and air to the soap. The main chemicals that you find in soap are ammonium lauryl sulfate and sodium dodecyl sulfate. Both of these are
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Why is a sandwich called a sandwich? It is named after John Montagu, the 4th Earl of Sandwich, but he isn’t the person who invented it. There is no way to work out when sandwiches were invented because people presumably ate them once there was bread. A sandwich merely consists of a filling between two
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What is leukemia? Leukemia is a type of cancer that begins in the bone marrow. It is a group of different cancers, rather than one type of cancer. “Leukemia” comes from the Greek words “leukos”, which means white, and “haima”, which means blood. It is named in Greek, but the Greek’s didn’t know what it
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What is a thorium reactor? A thorium reactor is a nuclear reactor that is powered with thorium and not uranium. Let’s look at how a current nuclear reactor works and then look at how a thorium reactor would work. Nuclear reactors work on the principle of nuclear fission. This is where an atom of a
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Why are the White Cliffs of Dover white? The White Cliffs of Dover are white because they are made of white chalk, which is a type of limestone. The White Cliffs of Dover are a very famous symbol of the UK. During the Second World War they were often sung about because when pilots crossed
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How does a CT scan work? A CT scan uses x-rays and computer software to produce a 2D or a 3D image of the section of the body being scanned. CT stands for Computed Tomography. “Computed” means calculated, or worked out. “Tomography” is “imaging by sections using any kind of penetrating wave”. Tomography is made
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What causes a fire tornado? A fire tornado is caused when the intense heat from the fire rapidly warms the air above the ground and makes it rise in a spiral. Fire tornadoes are fairly common, but it is very uncommon for someone to see them because you would need to be in the middle
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How do you get a star in Hollywood? You have to be nominated, have been in the business for over five years, and someone has to pay $75,000 on your behalf, along with a few other requirements as well. There are currently 2,790 stars in Hollywood. This increases by 30 every year. They can’t all
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