Can gravity be used as a source of energy? No, gravity cannot be used as a source of energy. Gravity can be used to convert stored potential energy into useful energy, but gravity in itself is only a way of storing energy. Gravity isn’t the stored energy. Gravity can provide a force that can be
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What caused “The Troubles” in Ireland? “The Troubles” in Ireland had many causes that spanned centuries. I am going to look at four of the main causes today. These are the centuries of religious and political division, the partition of Ireland in 1921, the civil rights protests of the 1960s, and the escalating violence. The
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Where does the Scottish accent come from? Scottish accents developed over centuries as different languages spread across Scotland and influenced the way people spoke. They vary from town to town, just like any other country. The Scottish accent has a few features that are instantly recognizable. It is a rhotic accent for one. That means
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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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