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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Why don’t we move when we’re dreaming? Chemicals in the brain inhibit the motor neurons and stop them from triggering the muscles. As well as this, the membrane potential in the motor neurons decreases, meaning the nerves need more voltage to trigger them. We dream when we are in REM sleep, which is one of
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What happens in your brain when you learn a second language? The hippocampus and cerebral cortex get larger. The grey matter in the brain becomes denser and the amount of white matter increases. These changes are most noticeable in children that learn a second language from a young age, but they are also visible in
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Who owns the North Pole and the South Pole? This is a surprisingly difficult question. Technically, no country owns either of them, although a lot of countries make claims. Canada, Denmark, Norway, Russia, and the USA have made claims on the North Pole. Argentina, Australia, Chile, France, New Zealand, Norway, and the United Kingdom all
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Why does beer have alcohol? Because the yeast cells in the beer feed on sugar and produce ethanol. Yeast is an egg-shaped single-celled fungus. There are 1,500 different species of yeast. 1% of all fungal species are yeast. Humans use yeast for several things, but the most common are bread and alcoholic drinks. When yeast
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What is the Jevons Paradox? It is that improvements in efficiency of a machine increase the overall consumption of energy by making the machine cheaper and more efficient. The paradox is named after William Stanley Jevons who was an English economist and logician. He lived from 1835 to 1882, unfortunately drowning while bathing at the
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What is an anchorite? An anchorite or an anchoress were people who were walled into a small cell built into a church so that they could carry out a life of prayer and religious contemplation. Anchorites were men and anchoresses were women. The great majority of anchorites were actually women. Studies of the archives have
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Why can blowing up a balloon make you pass out? Because we hyperventilate and have too much oxygen and not enough carbon dioxide. Counterintuitively, it is too much oxygen and not enough carbon dioxide that can cause people to faint when they blow up a balloon. One would think that it is a lack of
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Are all bones made of calcium? Mammal bones and bird bones are all mostly made of collagen and calcium. Fish bones are either made of collagen and calcium, or of cartilage. Our bones, and all mammal bones, are not made only of calcium. Calcium is a large part, but it is not everything. Mammal bones
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