Why was Genghis Khan so effective? Genghis Khan was effective because of his military strategy, but also because he could take advantage of the natural abilities of the Mongols he commanded and of the weaknesses of the enemies he faced. Genghis Khan was born in 1162. His birth name was Temūjin, and he was the […]
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Why do churches have stained glass windows? The stained glass windows in churches were used to display religious stories to educate the congregation. They were also used because plate glass windows were not possible at such a large scale. And they were possibly used to show off the wealth and the power of the church.
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Why do people hoard? There is no one reason why someone becomes a hoarder and sometimes the reasons are not known at all. Let’s take a look at a few of the reasons that could apply to a hoarder. As with most things, there are different levels of hoarding. Somebody who keeps more than they
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Did the spice trade change the world? The spice trade changed the world because it not only allowed people to flavor bland or not quite fresh food, but it also allowed for the exchange of wealth and ideas and encouraged exploration. It was the first step on the path to globalization. When you are cooking
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Why does the year start on January 1st? The year starts on January 1st because of the Romans and then Pope Gregory XIII. Although, for most of the history of civilization, the year did not start on January 1st,, and for a lot of cultures, it still doesn’t. In fact, for the 1.4 Chinese people
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What is a mycorrhizal network? A mycorrhizal network is a web of fungal organisms that spread underground and connect trees together. When we think about fungus, mushrooms and toadstools spring to mind, but these are only the fruit of the fungus and are produced so that the fungus can spread its spores. The main part
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How does a self-cleaning surface work? There are two basic ways to make something self-cleaning. You can make it superhydrophobic or superhydrophilic. Both of these methods will use water to clean the object. Self-cleaning surfaces are very useful for places that are difficult to get to and manually clean, such as the windows on the
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What caused the US dust bowl? The dust bowl was caused by a combination of factors including bad farming practices, drought, high winds, and the economy. The dust bowl was named in 1935 by a reporter called Robert Geiger, but it was a phenomenon that had started in 1930, with causes going back long before
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How does our night vision work? We have night vision because our eyes can use their rods, which are more sensitive to light. Night vision is technically called scotopic vision, which comes from the Greek skotos, which means darkness, and opia, which means sight. Our eyes have two ways of detecting light. We have rods
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What is the difference between coal, coke, and charcoal? Charcoal is made from wood, but coal and charcoal are both sedimentary rocks that are processed differently to produce different results. Charcoal, coal, and coke all have different advantages, disadvantages, and uses. Let’s look at them one by one. Charcoal is made from wood. If you
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