How did a Roman aqueduct work? An aqueduct works by moving water from an area of higher elevation to an area of lower elevation using the force of gravity. The word aqueduct comes from Latin, and we still use several Roman aqueducts, but the Romans didn’t invent the aqueduct. The word is made from “aqua”, […]
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Why do crabs use sea anemones as weapons? The crab, known as the pom-pom crab, uses sea anemones to defend against predators and to sting its prey. There are three types of symbiotic relationships in the world. The first is mutualism. In a mutualistic relationship, both parties receive a benefit that they would not be
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What are the Olmec colossal heads? The Olmec colossal heads are a group of 17 giant heads carved out of stone by the Olmec people in sometime before 900 BC. The Olmec people were an early civilization living in what is now the Mexican states of Veracruz and Tabasco, in the south of Mexico, near
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Why did Napoleon invade Russia? Napoleon invaded Russia because he wanted to force back Russian troops and consolidate all of his power in Europe. He assumed that he would be able to defeat the Russians and, as Hitler did later on, underestimated them. Napoleon had come to power through a coup in 1799 and made
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Why do things go stale? Things go stale because they either lose water or they gain water, making them difficult to eat. If you leave food out on your kitchen counter, it very quickly starts to go stale. Foods that are soft tend to get hard, and foods that are hard tend to get soft.
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What is Peto’s Paradox? Peto’s Paradox is an observation that the occurrence of cancer in an organism doesn’t increase in line with the number of cells that organism has. Because cancer is caused by mutations in cells, it would be logical that the more cells an organism has, the more occurrences of cancer it will
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How does a hair transplant work? The basic idea is to take hair from the part of your head that still has it (usually the back) and transplant it to the part of your head that no longer has hair (usually the front or the top). Baldness is fairly common, and it is estimated that
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When did knights stop wearing armor? Knights stopped wearing armor when muskets began to be used more widely in battles. There are many types of armor, and it has evolved over the centuries. We are all familiar with the iron and then steel armor that knights often wear in movies. We have also probably seen
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Why can’t I walk through a wall? We can’t pass through a wall because of the Pauli Exclusion Principle and because of electromagnetic repulsion. If you think about it on the microscopic level, there is a huge amount of space between the atoms in anything. They are like planets in the solar system. So, if
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How are undersea Internet cables laid? Undersea Internet cables are basically laid by spooling them off a very large ship. When you use the Internet, your computer has to somehow connect to the server where all of the information for whatever site you are searching for is stored. Those servers are in many different countries,
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