Why are bridges designed to move? Because they expand and contract, because the wind moves them, and because the land on either side of them moves. When you drive on and off a bridge, you may have noticed there is a slight gap at either end. This gap usually has a metal bracket on it […]
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How does a helicopter with two rotors work? The rotors rotate in opposite directions and are on a transmission so that they don’t collide with each other There are over twenty different types of helicopter that have two rotors. The Chinook is probably the most famous. It was invented in 1961, but the first tandem-rotor
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Why does a boomerang come back? One wing travels faster than the other which causes it to fly in a circular path. However, not all boomerangs are designed to come back and the one most people are probably thinking of is the modern version of the boomerang. The boomerang was a weapon used by the
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What are rare earth metals? They are a group of 17 elements on the periodic table that are spread out so much in the earth that they are difficult to mine, hence the name “rare”. There are seventeen rare earth elements, and they all have different uses. Here they are with their uses: Yttrium –
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Why aren’t there flying boats anymore? Because landing and takeoff is rough, they are not very stable, engines became more powerful, more runways on land were built, and the sea is very corrosive. Before we start, let’s have a quick look at what a flying boat actually is. You are probably thinking of one of
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Why do British people say football and Americans say soccer? Britain used to call football soccer until about 1980 when they started to call it football. Before we start, this article is about the sport of two teams of eleven people trying to kick a ball into each other’s goal. Not the sport that is
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How thick is tank armor? It depends on the tank, the type of armor, and the location on the tank, but armor is roughly between 10 cm at its thinnest and over a meter at its thickest. The tank with the best armor is said to be the Challenger 2. However, for obvious reasons, the
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Why do some countries drive on the left? Because of the way carts were built and then not wanting to change. There are 56 countries that drive on the left-hand side of the road, which is approximately 30%. With the exception of Japan and a few other countries, they are predominantly countries that used to
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What is the Streisand Effect? It is when you try to hide something but end up bringing more attention to it than if you had just left it alone in the first place. The Streisand Effect is named after the American singer and actress Barbra Streisand. The effect has been around for as long as
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How does ceramic armor work? It shatters the projectile, absorbing and spreading out the kinetic energy from the projectile over a wider area. The first thing to clear up is that ceramic armor plates are made of a different type of ceramics than the mugs and cups in your kitchen. There are many different types
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