Who invented the sewing machine? Just like many inventions, it wasn’t only one person who invented the sewing machine but four people over a gap of roughly 60 years. Modern sewing machines can create many different types of stitches, from decorative to purely functional. The earliest sewing machines could only make a stitch called a […]
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Why do scientists disagree about how siphons work? Scientists understand exactly how siphons behave, but there is an ongoing debate over which physical principle deserves most of the credit. It could be atmospheric pressure, it could be the cohesion between water molecules,or it could be a combination of the two. A siphon is a device
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What is the interstellar medium? The interstellar medium is the matter that fills space between the stars in a galaxy. The atmosphere of a star varies depending on its size, but they are all similar in that they get thinner the further out from the star you go. Once you leave the surface of the
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How did fish and chips become a traditional British food? Fish and chips became a traditional British food thanks to fried fish brought from Spain and Portugal, chips brought from Belgium and France, railway networks, improved agriculture, urbanization, entrepreneurs, and wartime thinking. If you have traveled to Britain, you will undoubtedly have tried fish and
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How did we discover Neptune? Neptune is the only planet in the Solar System whose existence was predicted by mathematics before it was observed. Neptune is the furthest planet in our solar system. It has about 17 times the mass of the Earth and is a gas giant. There is a lot of methane in
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Why don’t metronomes slow down? Mechanical metronomes do slow down eventually, but not in the same way that a normal swinging pendulum does. A simple pendulum loses energy with every swing because of friction and air resistance. A metronome has a wound spring inside it that keeps adding a little energy back into the movement,
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Why was Gettysburg important? Gettysburg was important because it was the symbolic turning point in the American Civil War and not just because of Lincoln’s famous speech. The majority of people probably know about Gettysburg because of the famous speech Abraham Lincoln gave there. He was speaking four months after the battle had been won
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What is a solar tube? A solar tube is a way of channeling natural sunlight into a house to provide natural illumination without needing power or a window. Solar tubes are also called light tubes, solar pipes, or sun tunnels. These names pretty much tell you exactly what they are designed to do. A lot
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Who invented algebra? Algebra was invented by many people over many years, but Muhammad ibn Musa al-Khwarizmi is known as the “father of algebra” and it is from his seminal work that we get the word “algebra”. The word algorithm also comes from the Latin version of his name “Algorismus”. Algebra is a branch of
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How does a smartwatch measure pulse and blood oxygen levels? A smartwatch measures both pulse and blood oxygen levels by shining different colored lights through your skin and into your blood vessels. These days, smartwatches have more and more functions, and many of those functions are to do with health. Two things they can do
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