What is quantum tunneling? Quantum tunneling is a phenomenon where an electron or an atom can pass through an energy barrier without having enough energy to get through it. To get through barriers, energy is usually required. A brick wall is a barrier. If I want to get through that wall I need to have […]
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How can we measure the depth of the ocean? There are several ways to measure the depth of the ocean. You can use a weight on a piece of rope, sonar, or radar and satellites. Oceans cover roughly 70.8% of the Earth’s surface. They range from a depth of millimeters at the shores, down to
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What is HOLMES? HOLMES is the Home Office Large Major Enquiry System. It was so named because it is the same name as the great detective Sherlock Holmes. It is a computer system that the UK police use to collate all of their data about crimes in the country. At its simplest, HOLMES is a
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When was the first train robbery? It depends what you mean by robbery. Things had bee stolen from stationary trains since they had become popular. The first robbery from a moving train is unknown, but a good example was an 1849 robbery in the UK. And the first hold up of a train in true
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Why did we evolve to see the part of the light spectrum that we can see? We evolved to see the range of the light spectrum that we can see because it was the most available and easily detectable. If our planet had a different atmosphere and our sun was hotter or colder, we may
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When was the first national debt? The first systems that resembled modern national debt developed in the Italian city-states during the 12th century. These days we are very used to countries being in debt. The USA, for example, as of 2026, the United States has a national debt of around $40 trillion. That is such
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Why do physicists think dark energy exists? Physicists think dark energy exists because something must be overcoming the pull of gravity to be speeding up the expansion of the universe. 13.8 billion years ago, the Big Bang happened and the universe began to expand. This is often described as an explosion into space, but it
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When did billboards become a thing? Billboards have been around for years, but the modern style was created in the early 19th century. Billboards really took off with the growth of modern transportation. A board to post bills on has been around since people have been able to write on some kind of material, such
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Who was the most important person in early Christianity after Jesus? There is no obvious “most important” person, but Peter, James, Paul the Apostle, and Constantine the Great were all extremely important. Obviously, Christianity wouldn’t exist without Jesus Christ, but in the early days, the likelihood that it would become the global religion it did
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How did sailors get fresh drinking water? Sailors got fresh drinking water from the barrels stored on the ship, rainwater, stocking up whenever they made land, and occasionally desalination. These days, most of us rarely use a boat. If we do, it might be a short ferry crossing, or possibly a cruise. We don’t give
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