How is sewage treated? There are several different methods, but sewage generally goes through four steps before the water is safe enough to drink. Sewage isn’t only the wastewater from our toilets. It can be other wastewater from our houses, containing soaps and household products. It can also be industrial wastewater, containing chemicals and other […]
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Where did Jazz come from? It started in New Orleans in the 1890s. What is Jazz? The word “jazz” probably comes from “jasm”, a slang expression meaning pep or energy. Jazz started out as jas and didn’t become jazz until about 1916. That means jazz wasn’t really considered a separate style of music for almost
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Could Earth survive without the moon? The planet would survive, but the living organisms on it might have a harder time. The moon was probably formed when another protoplanet hit the young Earth, obliterating both and making the Earth and moon from the resultant mush. The moon began life at a distance of about 22,500
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How does a speedometer work? By translating the speed of the wheel’s rotation into a magnetic field. These days, electronic speedometers are becoming more common, but mechanical ones are still the norm. Let’s look at mechanical ones first. The mechanical speedometer has a dial that sits in the dashboard and miles or kilometers around the
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Why is a strike called a “strike”? Because sailors in 1768 struck their ships. To strike a ship means to take off its topsail, making the ship incapable of movement. The word “stricken” comes from the same place. As in, the ship was stricken on the rocks. On a ship, the command to take down
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Where is the source of the Nile? The Nile starts as the White Nile and the Blue Nile before they come together. The White Nile probably starts in Lake Rweru and the Blue Nile probably starts in Lake Tana. The Nile is one of the longest rivers in the world. It used to be the
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What makes our joints pop and click? Escaping gas, moving tendons and ligaments, or rubbing surfaces. There are about 360 joints in the human body, although that depends on age. A joint is the connection between two bones that connects them and allows them to move. Without joints we would be unable to move. There
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What is the difference between carnivores, herbivores, and omnivores? Amongst other things, they have differences in their teeth, mouths, eyes, saliva, intestines and their stomachs. Herbivores obviously live off plants. They are known as primary consumers because they eat the energy that the plants have produced through photosynthesis and introduce it into the food chain.
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How small is nanotechnology? It is between 1 and 100 nanometers. 1 nanometer is 0.000001 mm. It is hard to imagine how small that is. A human hair is about 0.1 mm wide, which makes it 100,000 nm. Nanotechnology is between a thousand and a hundred thousand times smaller than the width of a hair.
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What is the oldest stone circle in the world? Probably the stone circles at Göbekli Tepe, which are almost 12,000 years old. A stone circle is literally a ring made of standing stones. There were many earth circles and wooden stake circles made as well, but they haven’t lasted as well as the stone circles.
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