How do birds ride thermals? Birds ride thermals by flying in tight circles and by having specialized feathers and wings. Some birds, such as eagles, are able to make use of thermals and fly to great heights without using much energy. If a bird wanted to fly to a height of 3 km, it would […]
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Why are leaves different shapes? Leaves are different shapes because of the conditions they have evolved to survive in. That might be for catching more sunlight, for saving water, to not be eaten by predators, or for staying cool. Leaves on a plant or a tree are a constant tradeoff. The main purpose of a
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How were the Terracotta Warriors found? The Terracotta Warriors were found accidentally by farmers digging a well. The Terracotta Army was buried in 221 BC and it wasn’t uncovered again until it was found by farmers in 1974. There was a bad drought in the area, and Yang Zhifa and his five brothers were desperate
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]Why did the English Civil War happen and why did the Interregnum only last 11 years? The English Civil War happened because King Charles I and Parliament couldn’t agree on the balance of power, finances, and religion. The Interregnum only lasted 11 years because Oliver Cromwell’s son, Richard, was not a good enough leader to
How did we work out the age of the Earth? The age of the Earth has been calculated by looking at the oldest minerals here on Earth, rocks on the moon, and meteorite rocks. The Earth formed roughly 4.54 billion years ago. However, that is a date people have only known with certainty since 1953,
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What are the differences between a brown, red, orange, yellow, blue, white, and black dwarf? The main difference between them is their state of stage of life. Red, orange, and yellow dwarf stars are living stars. Brown dwarfs are failed stars. White and black dwarfs are dead stars. Blue and black dwarfs are theoretical because
Why is the alphabet in that order? There is no logical reason why the alphabet is in the order it is in. It is mostly an accident of history and of the languages that used it. Before we begin, let’s be clear that I am talking about the Latin alphabet that has 26 letters and
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How did it take so long to invent zero? Zero took thousands of years to invent because there was no need for it. There is evidence that people have been counting for 50,000 years. Ancient people counted using tally marks. Cave walls, bones, wood, and stones have been found with tally marks scratched into them.
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Is Troy a real place? Almost certainly, Troy was a real place. It was located in present day Turkey. However, a Trojan war is only a possibility, and the two poems in which the city is mentioned are probably a mixture of history and legend. The location of the city of Troy was identified by
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What is the Local Bubble? The Local Bubble is an enormous cavity 1,000 light years across that our solar system is currently traveling through. We might think that space between the stars and planets is completely empty, but it isn’t. Depending on where it is, most of interstellar space has about 0.3 to 0.5 atoms
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