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 is a nerve? They are bundles of nerve fibers called axons that connect neurons. They look like cables. Their job is to transmit electrical impulses. All animals have nerves. They are the only way that living organisms can send signals from their brain to their muscles or parts of their bodies. The only animals
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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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Are symbiotic relationships always beneficial to both parties? No, they aren’t. There are mutualistic, commensalistic, and parasitic symbiotic relationships. The word symbiosis means “a close, prolonged association between two or more different biological species”. It originates with the Greek word symbiosis and means living together. We tend to think that a symbiotic relationship is beneficial
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Why are electromagnets stronger than permanent magnets? Because the amount of current and the number of coils in the copper wire can increase the strength of an electromagnet while a permanent magnet cannot be any more magnetic than it already is. The strength of a magnet is measured in different ways, but one way 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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What causes a heat wave? It is caused when high-pressure air traps a layer of heat near the surface of the Earth and raises the temperature. A heat wave is called when the average temperature for that time of year is higher than the historical average for more than two days in a row. Recently,
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