What is asbestos? Asbestos is a material made of lots of mineral fibers. It can be woven into shapes and it is fire-resistant. Asbestos is a natural mineral that is mined and then processed. There are six different types of asbestos, and they are divided into two categories: amphibole and serpentine. The fibers in the […]
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When did people start using passports? The idea for the modern passport was introduced by the League of Nations in 1920, shortly after the end of World War 1. It was basically a way to control immigration. The idea behind the passport has existed since the very first nation states. A passport was a document
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Where did stoicism come from? It was invented in Athens in 300 BC, by Zeno of Citium (modern day Cyprus). Stoicism is a philosophy that seems to enjoying a revival these days. You see lots of videos of people on Instagram and YouTube who espouse the stoic lifestyle. So, what exactly is stoicism? Stoics believe
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How many countries are nuclear powers? There are 9 countries that have nuclear weapons. They are the United States, Russia, China, France, the United Kingdom, Pakistan, India, Israel, and North Korea. Between them, they have a grand total of 13,000 nuclear weapons. One nuclear weapon can destroy a city. If all 13,000 of those nuclear
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Why is there an obelisk in Rome? There is more than one and the Romans took them from Egypt as a show of power. During the Roman Empire, 50 obelisks were taken from Egypt and 13 of those survive today. 8 of those 13 were made in Ancient Egypt and the other 5 were commissioned
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What is impressionism? It was a style of art where the artist was trying to capture an impression of the moment. Claude Monet is probably the most famous impressionist, and he was one of the few artists who was able to make money while he was alive. Impressionism began in Paris in the late 1800s
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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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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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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 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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