How many tunnels did the Vietnamese dig? During the Vietnamese War, the North Vietnamese forces managed to dig a 400 km tunnel system that they used to hide and to attack the South Vietnamese and Americans. Tunnels have often been used as a tool of war. They weren’t often used in ancient battles, because it […]
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Is alchemy actually possible? With today’s technology, alchemy is technically feasible, but making a lot of gold would require more energy than is practical. These days, we associate the word alchemy with the attempt to change base metals, such as lead, into gold, so called precious metals. However, that is not what alchemy is. Alchemy
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Who was Tutankhamun? Tutankhamun was an Egyptian pharaoh who lived from 1341 BC until 1323 BC. He was only 19 years old when he died. He was pharaoh for nine years, from 1332 BC until he died in 1323 BC. He is probably the most well known of all the Egyptian pharaohs because of his
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How does anesthesia work? Most anesthetics work by blocking the signals to nerves. There are some aesthetics where scientists don’t know how they work. The word “anesthesia” comes from Greek, through Latin. The Greek word was anaisthesia, and it means “lack of feeling, perception, or sensation”. The route “an” means “without”. The word was only
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Why do they put fluoride in water? Not a lot of countries puts fluoride in their water supply, but those that do use fluoride, do it to strengthen people’s teeth and make them more resistant to tooth decay and cavities. There are two types of fluoridated water: artificial and natural. 5 countries in the world
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How many ice ages have there been? There have been five major ice ages through the history of our planet, but there have been several smaller ones as well. What is an ice age? An ice age is a period in time where the global temperature falls to the point where water freezes and ice
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Why are bird nests s strong? The way that birds build nests depends very much on the birds. Different birds use different materials, different methods, and some birds don’t even build nests at all. However, the nests that birds build in trees tend to be strong because of their saliva. Birds that don’t build nests
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Why is an atomic clock so accurate? Atomic clocks are accurate because atoms oscillate at a stable and predictable frequency. All clocks work by using the number of movements of something to calculate the passage of time. They do this by knowing how many movements of something equal a second and working from that. Mechanical
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Why is a pronghorn so fast? The pronghorn evolved to have phenomenal speed so that it could outrun predators that no longer exist. A pronghorn is a hoofed mammal that lives in Western and Central North America. It belongs to the artiodactyl family. This family contains antelopes, hippos, deer, giraffes, camels, and 265 other animals.
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What happened at Dunkirk? 338,226 British and French soldiers were evacuated from the beach at Dunkirk over the space of 8 days. That was far better than anyone in the British government expected, but about 20,000 soldiers died and 90,000 were captured by the Germans. Along with that, 300 ships were sunk, 100 planes were
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