Why was the Hoover Dam so difficult to build? Because the river was very strong and the dam was so big, the concrete would take 125 years to set. A new source of irrigation and drinking water was needed by the end of the 19th century as more and more people settled the south west […]
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What was the last Apollo mission? The last Apollo mission was Apollo 17. The Apollo program stretched from 1967 until 1972. There was supposed to be an Apollo 18, 19, and 20 but they were all cancelled. The booster for Apollo 20 was repurposed to launch Skylab, America’s first space station into orbit. The decision
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How can we catch a ball without looking at it? It is a combination of proprioception and the brain’s ability to predict. What is proprioception? It is the ability to sense your own body position. It is often called the sixth sense. All of our muscles, joints, and tendons have sensory receptors in them. When
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Why does the house always win in a casino? The house always wins because of the odds they give, the way casinos are set up, and because of psychology. Why is a casino called the house? It’s because the word “casino” comes from the Latin, through Italian, word “casa”, which means “house”. “Casino” means “small
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Why do we lose our voice when we are sick? We lose our voice because our vocal cords become inflamed. Let’s look at how the voice works to start with. We all have vocal cords inside our larynx, more commonly known as a voice box. The larynx is at the top of the trachea, the
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What is the difference between a forest, a wood, and a copse? These days, the difference is in the size, but it wasn’t always that way. Let’s look at all three of them. What is a copse? These days a copse is defined as a small group of trees. There is no defined size or
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Why is Las Vegas in the desert? Because it is a good location for a stop on the new southern Californian railway line. Las Vegas wasn’t the first settlement to spring up in the desert of Utah. The area used to be lush marshland, but that all dried up and formed the Mojave Desert, except
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How big and how small can a mammal be? The Etruscan shrew is the smallest mammal and is 40 mm long and weighs 2 g. The blue whale is the largest mammal and is 29.9 m long and weighs 199 tons. The African elephant is the largest land animal and is about 4 m tall
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How does a joint replacement work? By replacing parts of the joint, or by replacing the whole joint. Joint replacement surgery is called arthroplasty. It is made from the Greek word “arthro”, which means joint and “plasty”, which means to mold or form. It is carried out when a joint is no longer usable or
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Where was the first artificial dam? The Jawa Dam in Jordan. Natural dams exist all over the world and can be formed by landslides or trees getting caught at a narrow point in a river. It wouldn’t be difficult for early people to see how it is possible to dam a river. However, until people
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