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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Is category 5 the strongest a hurricane can be? A category 6 hurricane is possible, but not with the current method of measuring hurricanes. The hurricane category system is called the Saffir-Simpson Hurricane Scale. As the name suggests, it was invented by two people called Saffir and Simpson. Herbert Saffir was a civil engineer and
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Why do we use A4 as a paper size? We use A4 because it is a ratio of A0, which is 1 square meter of paper. The A system of paper was invented in Germany and adopted by almost all of the countries in the world in 1975. The only countries that don’t use it
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Does the Vatican have a secret library? No. The Vatican doesn’t have a secret library. There are some sections that are restricted, and there are some recent records that are off limits, but no more than many other government libraries and there are certainly some governments that are much more secretive. The Vatican library is
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How much weight could a human lift? This is a difficult question to answer because there are too many variables, but possibly three or four tons. There are many ways of lifting weight and there are different records for each method. The heaviest weight ever lifted by a human is purported to be 2,844 kg,
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Why are the majority of people right handed? No one knows for definite, but it could be because we process language with the left side of our brain. It is generally thought that 85 to 90% of people are right-handed. The majority of the rest are left-handed, with a very few individuals being ambidextrous. A
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Why do they add a smell to gas? Gas companies add an additive called mercaptan to natural gas so that people can smell it in the event of a gas leak. The natural gas we use to cook with or to heat our houses and our water doesn’t smell of anything. Natural gas contains many
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