How does a motion detector work? There are several different methods. They can use infrared light, microwave radiation, ultrasound, video, or electromagnetic radiation. There are many uses for motion detectors and not all of them are for security systems. If you have used an automatic door, or walked into a room and had the lights […]
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Why are prunes a laxative? They contain a lot of two different types of fiber, sorbitol, and polyphenols. What is a prune? Prunes are dried plums, although not all plums can become prunes. Plums also have laxative properties, but they are not as effective as prunes. In America, in 2001, some prune producing companies petitioned
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Is there a planet beyond Neptune? It is possible, but there is no way to know for sure until telescope power increases. Neptune was discovered in 1846 and it was the last planet to be discovered. Pluto was discovered in 1930, but it wasn’t a planet for very long before it was demoted to “dwarf
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What is a zombie virus? Zombie viruses are ancient viruses that have been frozen in ice, but are being released as the permafrost melts due to climate change. “Zombie” virus is rather a dramatic name. These viruses won’t turn people into zombies and they don’t come from zombies. They are given this name because they
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What happened to the water on other planets? It was either blown off, evaporated off, or is still there but frozen in ice. The first thing we have to consider is that not all of the planets have water. Pluto has obviously been deregulated and is no longer a planet. Earth has water. Saturn and
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Why did the Chinese government move to Taiwan? The Republic of China’s government lost a war with the Chinese Communist Party in 1949 and fled to Taiwan. We have to go back a bit further than 1949 to look at this question. People have lived on the island of Taiwan for thousands of years. Stone
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How does a rattlesnake rattle? They have loose hollow scales on the tips of their tails that strike each other when the rattlesnake rattles its tail. Rattlesnakes are a type of viper and are venomous snakes. There are many different types of venomous snakes, and they are divided by the position of their fangs and
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How much oil is left? About 1.5 trillion barrels, which is enough oil for roughly 47 years. There are several problems with this question. The first problem is that there are probably oil reserves that we don’t know about. The second problem is that oil drilling technology improves. The third is that estimates of how
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What are El Nino and La Nina? They are climate patterns that happen in the Pacific Ocean and affect weather all over the world. El Nino means “Little Boy” and La Nina means All of the climate in the world is connected and changes in one place can lead to climate events in other places.
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How do birds land? It depends on the size of the bird and whether it is a landing on land, a branch, or water. Generally, they lose as much speed as possible and grab on. The physics behind the way birds fly is the same as for airplanes. Anything that flies needs lift and thrust,
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