Is household dust made of dead skin? There is a myth that household dust is made entirely of dead skin cells. It is true that sometimes as much as half of household dust is dead skin, but there are many other things in it as well, depending on where you live and your house. We […]
#1424 Is household dust made of dead skin? Read More »
How do you soundproof a room? There are several ways, but the basic way of soundproofing a room is to make sure that there are no gaps in the walls or door and cover all surfaces in a material that absorbs sound. Sound is caused when energy is transmitted through something in a wave. When
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How do some animals freeze and not die? There are a few animals that can freeze solid in the winter and then thaw out again in the spring without any damage to their bodies. They do this by producing a type of antifreeze. We could easily freeze solid in the winter, but that would be
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How does our balance work? We balance by using our visual system, our proprioceptive system, and our vestibular system. The visual system is obviously our eyes, the proprioceptive system is in our muscles and joints, and the vestibular system is in our inner ears. Some people have much better balance than others, but we all
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How did the Incas build their roads? The Incas built an extensive road network by using a labor tax, but they used different construction techniques depending on the landscape they were building through. We have a lot of roads today. It is estimated that there are 200 million km of roads around the word at
#1420 How did the Incas build their roads? Read More »
How many of Nostradamus’s predictions have come true? The number of Nostradamus’s predictions that have come true depends very heavily on how you want to look at it. If you are asking how many have come true, then the answer is 0. If you are asking how many can be made to sound as though
#1419 How many of Nostradamus’s predictions have come true? Read More »
Why was the Waldorf-Astoria hotel built because of a feud? The Waldorf-Astoria hotel was built because of a dispute over who should be able to use the name “Mrs. Astor”. The original Waldorf-Astoria hotel doesn’t exist anymore. It was knocked down in 1929 and the land was sold to the Empire State Inc, a group
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How did the Phoenicians dominate the sea for a thousand years? The Phoenicians were able to dominate the sea for nearly a thousand years because of the ship technology they had, because of the way they controlled their colonies, and because of the collapse of other civilizations during the Bronze Age.. The Phoenician Empire wasn’t
#1417 How did the Phoenicians dominate the sea for a thousand years? Read More »
How does a 3D movie work? A 3D movie works by having two very slightly different versions of the movie that are filmed a tiny distance apart. We, like most predators, have our eyes at the front of our faces, pointing forwards. Most prey animals have their eyes at the side of the head. The
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How does an earthquake early warning system work? An earthquake early warning system works by detecting the P wave that comes from the earthquake’s epicenter. Earthquakes are caused when tectonic plates jam against each other and then suddenly move. There are three types of tectonic plate boundaries. There are divergent boundaries. These are where two
#1415 How does an earthquake early warning system work? Read More »
