When did we start using taxis? The first taxi service was started in London, UK in 1605. Just as with buses, it took several changes in society before a taxi service became necessary or possible. Before we look at that, though, let’s look at the origin of the word “taxi”. Taxi is a shortened form […]
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How do ultramassive black holes form? Ultramassive black holes can form when supermassive black holes collide. To make a supermassive black hole, we need to start with a regular black hole. Black holes can form when a very large star collapses in on itself. The star has to be very large, at least 25 times
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What causes a fire tornado? A fire tornado is caused when the intense heat from the fire rapidly warms the air above the ground and makes it rise in a spiral. Fire tornadoes are fairly common, but it is very uncommon for someone to see them because you would need to be in the middle
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Why can you graft onto a plant? You can graft onto a plant because they don’t have an immune system. There are several ways of grafting plants, but the method I am thinking about is called cleft grafting. In cleft grafting, a cleft is cut into the trunk of a tree of the stalk of
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How do you get a star in Hollywood? You have to be nominated, have been in the business for over five years, and someone has to pay $75,000 on your behalf, along with a few other requirements as well. There are currently 2,790 stars in Hollywood. This increases by 30 every year. They can’t all
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Is category 5 the strongest a hurricane can be? A category 6 hurricane is possible, but not with the current method of measuring hurricanes. The hurricane category system is called the Saffir-Simpson Hurricane Scale. As the name suggests, it was invented by two people called Saffir and Simpson. Herbert Saffir was a civil engineer and
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Why do we use A4 as a paper size? We use A4 because it is a ratio of A0, which is 1 square meter of paper. The A system of paper was invented in Germany and adopted by almost all of the countries in the world in 1975. The only countries that don’t use it
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Does the Vatican have a secret library? No. The Vatican doesn’t have a secret library. There are some sections that are restricted, and there are some recent records that are off limits, but no more than many other government libraries and there are certainly some governments that are much more secretive. The Vatican library is
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Why do teeth have nerves? We have nerves in our teeth to provide us with feedback on what we are eating and how much pressure we are applying. Teeth appear to have nerves for three reasons. The first reason is because the inside of the tooth is living tissue with a blood supply and where
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How good is an elephant’s sense of smell? Elephant’s have a better sense of smell than any other animal on Earth. We know that our sense of smell is pretty basic when we compare it to a lot of other animals, but that makes sense because we have evolved for more of our brain to
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