How do you build a tunnel underwater? You can either build the tunnel above ground in pieces and lower it into the water, or you can dig the tunnel underground. Humans have been making tunnels for thousands of years. The art of tunneling probably started when prehistoric people wanted to make their caves bigger. […]
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What did the last emperor of china do later in life? He spent the last years of his life working as a road sweeper, a gardener, and an editor. The last emperor of China was Aisin-Gioro Puyi. He became emperor in 1908 at the age of two when his half-uncle died without children.
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How much of your liver can you live without? Surprisingly, you can survive with only 25% of your liver. Where is your liver and what does it do? The liver sits just above your stomach. It weighs about 1.5 kg and is the largest organ in the body if you don’t count the skin.
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When did people start eating cereal for breakfast? Technically in the 1850s, but it didn’t catch on until the early 1900s. The first breakfast cereal (albeit hot) was invented by Ferdinand Schumacher, a German immigrant living in America. He used a hand grinder to grind oats that he then sold for oatmeal. The oats were
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I learned this today. Why are some places more humid than others? It is because they are closer to a large, warm body of water, which causes warm winds and warm air can carry more water vapor than cold air. What is humidity? Humidity is the concentration of water vapor in the air. The air
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I learned this today. When was the first passenger train? The first passenger train was Locomotion No. 1. It departed on the Stockton and Darlington Railway on September 27th, 1825. Railways go back thousands of years, but they haven’t always been used to carry people. The earliest railway ever discovered was in Greece, built in
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I learned this today. Why do horses need horseshoes? They only need horseshoes if they are going to be walking on hard or rough surfaces for a long time. The hoof of a horse consists of several different parts. The part that we can see is called the wall. This is up to two centimeters
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I learned this today. How does fly spray work? By blocking the insect from using its nerves to move its muscles. There are two kinds of fly spray. There are repellents, which are sprays you apply to your body to stop insects landing on you and biting. Then there are insecticide fly sprays that kill
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I learned this today. How does a virus infect the body? By replicating itself inside the body’s living cells. A virus is not a cell. It is called a virion. A cell has a cell membrane, a nucleus, and cytoplasm. A virion doesn’t have any of that. It is made up of a set of
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I learned this today. How does a desalination plant work? A desalination plant makes freshwater from seawater by using reverse osmosis. Humans and animals obviously cannot drink salt water. Fish have adapted to be able to do it, but we have not. There is about 35g of salt in every liter of sea water. If
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