Is there a center to the universe? No, the universe has no center. Every part of it is expanding away from every other part. When we think of the beginning of the universe, we think of the Big Bang, and when we think of the Big Bang, we think of an explosion from one point […]
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What are perovskite solar cells? Perovskite solar cells are a type of solar cell that could potentially replace regular solar cells because they are thin, lightweight, cheap to make, and potentially very efficient. There are different types of solar panel technology at the moment, but the majority of them work with silicon semiconductors. Silicon is
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What is the Big Mac Index? The Big Mac Index is an informal way of working out purchasing power parity between different countries. The Big Mac Index was started as a half-serious joke in an article that appeared in The Economist in 1986. The author, Pam Woodall, was trying to find a way to look
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Why is Boxing Day called Boxing Day? Boxing Day is most likely called Boxing Day because of the tradition of wealthy families giving boxes of gifts, money, or leftover food to their servants and tradespeople. However, it could also come from churches giving charitable boxes to people in their congregation. It could be a combination
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Why do we write Xmas for Christmas? The “X” isn’t an X from the Latin alphabet; it is from the Greek alphabet, and it is “chi”, the first letter of the Greek word Christos, meaning Christ. I didn’t actually know until I started researching this topic today that some people think Xmas is an attempt
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What is a traffic light green wave? A traffic light green wave is a system where traffic lights are coordinated so that lights turn green in sequence to allow cars travelling at a specific speed to pass through without stopping, thereby reducing the overall congestion in the city. It is difficult to know how many
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What is an avalanche airbag? An avalanche airbag is a backpack that contains an inflatable balloon to increase the wearer’s volume. An avalanche happens when the snowpack separates from the ground and is pulled down the mountain by gravity. They can happen when there has been heavy snowfall, and the snowpack becomes too heavy to
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How can you focus on smart contact lenses? Smart contact lenses have sensors that can track your eye movements and the dilation of the pupil. They can automatically adjust their focus until you are able to see them. And they project the image directly onto your retina. If you are like me, your eyes are
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Are all snowflakes really different? Theoretically, yes, all snowflakes are different, but it is an issue of probability, and there is obviously no way to know for sure. Snowflakes form when the air is cold enough for water droplets to freeze. It is very difficult for them to freeze on their own; it is much
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Who was Jim Crow? Jim Crow was a fictional character played by a white actor in blackface in the 1830s, called Thomas Dartmouth “Daddy” Rice. He portrayed an African American slave called Jim Crow. The name later got taken up and made famous in the Jim Crow laws. The Jim Crow laws are not one
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