Why are there many different types of screw head? The different types of screw head allow for different amounts of torque and for use by different machines. There are over 30 different types of screw head. Prehistoric people generally joined things together using adhesives. The earliest known adhesive was a tar made from heating birch […]
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How does body armor work? By breaking up the bullet and removing its kinetic energy. Armor has been around for a long time, but it has always had to adapt to the technology of weapons. In the Bronze Age, they had bronze armor because it was enough to stop a bronze sword blade. Then the
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Can the Mona Lisa ever be sold? The Mona Lisa, by Leonardo da Vinci, can never be sold because it is owned by the people of France. There was a time when the Mona Lisa was owned by a single person. In fact, the painting was owned by a few single people, and could have
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What is & called and why? The symbol “&” is called the ampersand, which actually means “and, by itself, and”. It is also a shorthand version of the Latin word “et”. These days, we use the ampersand as a symbol for “and”. It is also used in programming language. It is not generally acceptable to
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What is a Scramjet? It is an air breathing jet engine that works at supersonic speeds. Right. There are three questions we need to unpack here. How does a jet engine work? How does a ramjet engine work? How does a scramjet engine work? A jet engine has fan turbines at the front of it
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Does ABS reduce fatalities in car accidents? Anti-lock braking systems (ABS) have made cars far safer, but they haven’t reduced fatal accidents because of something called risk compensation. Anti-lock braking systems are designed to stop the wheels of a vehicle locking up when the brakes are applied in an emergency. If the wheels on a
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Why are traffic lights red, yellow, and green? Because they cannot be mistaken for each other and we have learned that red means danger and green means go. When they were invented, traffic lights used white to mean “go”, green for “caution” and red for “stop”. The first traffic lights were not made for cars.
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How are tower cranes assembled? By raising themselves up and adding in a piece at a time. There are many different types of cranes, but they are divided into two categories: mobile and fixed. We are looking at the cranes that are used to build skyscrapers today, and they are fixed tower cranes. Any type
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How does a skeleton key work? By removing all of the parts that would get caught on the wards. Skeleton keys are also known as pass keys or master keys. They are called “skeleton keys” because all of the main parts of the key have been stripped off and only the skeleton is left. People
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What are the crown jewels? The crown jewels are a collection of 142 objects, many are used in ceremonies such as the coronation. The Crown Jewels are made up of 13 crowns, 6 swords, 6 sceptres, 16 trumpets, 13 maces, 3 robes, 3 rings, 3 coronets, 2 orbs, 1 spoon and bottle, and lots of
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