When did the British empire end? People take the return of Hong Kong to China on July 1st, 1997 as the end of the British Empire, but there are three points that could be taken as the end. The British empire has its start with Elizabeth I in about 1562 when she gave permission for […]
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What causes a tsunami? A very large and very sudden displacement of the ocean. A tsunami is a series of waves that are caused by a huge amount of water in the ocean suddenly being moved. It is different to a regular wave because the wave goes deep into the ocean. The word tsunami is
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When did globalization start? Depending on your definition, either with the Silk Road, the conquest of the Americas, after the Industrial Revolution, since World War II, or when the Soviet Union ended. The word “globalization” was coined in 1961. It was made popular in an article written for the Harvard Business Review in 1983: “Globalization
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Why did early humans leave Africa? They were probably forced out by climate change, but they could have left because of their rising intelligence. Let’s look at the evidence for why paleontologists believe humans developed in Africa and then look at why they left. Humans probably separated from the common ancestor we share with other
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Do any other animals cry? Yes, but only to lubricate their eyes. We have three types of tears. We have tears that lubricate and clean our eyes. These are called basal tears and they are created automatically. Every time you blink, the basal tears are spread across the eye and keep it wet and clear
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Why do soldiers break stride on a bridge? So that the vibrations don’t make the bridge collapse. This rule was introduced by the British Army in 1831. On 12th April 1831, the 60th Rifle Corps were returning from a military exercise and they crossed over the Broughton Suspension Bridge, which had been built five years
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How do glaciers move? Glaciers move because they are pulled downhill by gravity. A glacier is a river of ice that is flowing downhill. A river is a body of water that flows from a high elevation to a low elevation, usually ending in the sea or a lake, under the force of gravity. A
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What are the four fundamental forces? The strong force, the weak force, gravity, and the electromagnetic force. The four forces are the fundamental forces that govern everything in the universe. They are fundamental because they cannot be broken down into simpler parts and they are the reason behind all of the laws of physics. Gravity
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Why do some things bounce and other things don’t? Things that bounce have more elasticity than things that don’t bounce. For something to bounce, it has to has to have kinetic energy. It then has to transfer this kinetic energy to internal energy and then back to kinetic energy without losing any energy in the
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How does a canal lock work? By using gravity to increase the amount of water in the canal and rise the boat. There are two different reasons why canals need locks. The first is that canals are bodies of running water and so they have an upstream and a downstream, giving them a current. They
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