How do people breathe on a submarine? Submarines can carry a pressurized air supply, but most modern submarines make oxygen through a process called electrolysis. Producing enough oxygen for all of the people on a submarine isn’t the only thing to consider when trying to keep them alive. The air we breathe is 78 percent […]
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How do people live in the Arctic and the Antarctic? People live in the Arctic by staying warm, protecting themselves from the extreme weather, and having enough food to last through the winter. (In case you get confused, the Arctic is where the North Pole is located and the Antarctic is where the South Pole
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What was the Great Fire of Rome? The Great Fire of Rome was a huge fire that decimated the city of Rome in 64 AD. It is the fire that burned Rome while Emperor Nero was supposed to have been playing his fiddle. Most major cities that have a long history will have had a
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How does hydroelectric power work? Hydroelectric power works by converting the gravitational potential energy of stored water into kinetic energy, and then into electricity. As the first law of thermodynamics says, energy cannot be created or destroyed, only transformed from one type into another. This is what hydroelectric power does. A hydroelectric power station takes
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What is the Sargasso Sea? The Sargasso Sea is the only sea in the world that doesn’t have any land borders. It is located in the Atlantic Ocean and has an area of 3.5 million square kilometers. That makes it roughly 3% of the Atlantic Ocean. The Sargasso Sea is bordered by four ocean currents.
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What makes a rainbow? A rainbow forms when light is refracted, reflected, and dispersed by raindrops in the air. The rainbow can only be seen from an angle of 42 degrees. The sun, or the source of light, must be behind you. We can see a rainbow because of the speed of light through an
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What is a filibuster? Filibuster has two meanings that are connected. The original, historical meaning of the word filibuster, is someone who “engages in an unauthorized military expedition into a foreign country or territory to foster or support a political revolution or secession”. The more modern meaning of the word filibuster is political, and it
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What is the Dewey Decimal system? It is a system used to classify books in libraries, so that they can be found easily. It was created by Melvil Dewey in 1876. Libraries have existed since writing was first invented. Whatever was written needed a place to be kept in. However, libraries were not public. Clay
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What did Florence Nightingale do? She managed to improve hospital hygiene, made nursing into a profession, used statistical analysis, and became the first female member of the Royal Statistical Society. Florence Nightingale was born in 1820. She was British, but she was born in Florence, Italy, during a family tour of Europe, hence her name.
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What is self-raising flour? Self-raising (self-rising in the US) flour is wheat flour that has the leavening agent (usually baking powder) and sometimes salt already added to it. The purpose of self-raising flour is to (as it says in the name) rise on its own, which means without adding any other ingredients. When you are
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