What is price elasticity of demand? It is a measure of how much demand for a product changes depending on its price. An object’s elasticity is how much it can stretch. The elasticity of rubber is obviously higher than that of steel. In economics, the elasticity of a price is how much that price can
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How do flies perceive time? Flies see the world in slow motion, possibly seeing things four times slower than we do. We have probably all tried to swat a fly sitting on a table. You swing your hand towards it, you impact the table and you’re sure you got it, only to see the fly
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What causes turbulence? It happens when an airplane flies through turbulent air (hence the word turbulence) and gets buffeted around. Turbulence can cause a plane to suddenly rise or fall hundreds of meters very quickly. It can also cause a lot of shaking, and it can cause some damage to the plane, but it very
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What is the difference between a herb and a spice? Herbs are the fresh part of the plant and spices are the dried root, stalk, seed, or fruit. Herbs and spices have been used for thousands of years. People have used them to flavor food and as medicines. They are both different from vegetables because
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Are lighthouses still necessary? Yes, they are because technology can fail, and some things don’t show up on maps or with sonar. The Lighthouse Directory lists 24,300 lighthouses on its site. The majority of them are still active. This fact alone is enough to show that they are still necessary. Lighthouses cost money to run
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How does a Maglev train work? They use magnets to move the train forwards and to reduce friction. Maglev is the shortened form of magnetic levitation, and it is a train based on the principle of magnetic attraction and repulsion. We all know that when you have two magnets, the opposite poles attract each other
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What is flash memory? It is a type of memory that can store data without power and can erase memory in blocks. It is a type of electronically erasable programmable read only memory (EEPROM). Computers store information on their memory chips in binary, which means everything is reduced to a 1 and a 0. When
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Did Christopher Columbus really think he had landed in India? Not India, but the Indies, and, yes, he did. When Columbus said he was aiming for the Indies, he wasn’t thinking of India. He was thinking of the islands to the east of Asia, such as Indonesia, the Philippines, and New Guinea. There were no
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Why does it rain in a rainforest? Tropical rainforests cause rain when water is released by the trees, but temperate rainforests form where there is a lot of natural rain. There are tropical rainforests and temperature rainforests. Tropical rainforests form in very hot places, just to the north and the south of the equator. Temperate
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Why do giant redwood trees grow so big? It is a combination of things. It could be the amount of soil they have access to, it could be the climate in California, it could be their resilience, and it could be because they live so long. Giant Redwood trees are famous for their size. They
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