Who Was Kublai Khan?
Who Was Kublai Khan? Kublai Khan (September 23, 1215 – February 18, 1294) was the greatest, most intelligent and most cultured of the great Mongol leaders of Asia. He...
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What Is the Bayeux Tapestry?
What Is the Bayeux Tapestry? The Bayeux Tapestry, an ancestor of the strip cartoon, is embroidery showing, on a continuous linen band over 230 feet long, 20 inches...
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When Do Plants Breathe?
When Do Plants Breathe? Technically, plants don’t breathe. But plants do respire. Like animals, they use oxygen in the process of breaking down carbohydrates, and use...
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When Were Ducking Stools in Use?
When Were Ducking Stools in Use? Ducking stools first came into use as a punishment for women at the beginning of the 17th Century and were used in England as late as...
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When Were Submarines First Used?
When Were Submarines First Used? The first submarine which we know to have been used was built by a Dutchman, Cornelius van Drebel, in 1620. It was constructed of...
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When Does a Tree Stop Growing?
When Does a Tree Stop Growing? A tree never permanently stops growing as long as it lives. But in most countries each year’s growth is ended during the cold and...
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What Is a Camel’s Hump For?
What Is a Camel’s Hump For? A camel uses its hump as a portable storehouse of fat from which to draw nourishment when food is scarce. These odd protrusions are mounds...
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Why Are Some Moths Attracted by Lights?
Why Are Some Moths Attracted by Lights? Moths are attracted to lights at night because they mistake them for the light of the moon which they use as a means of...
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Where Would You Find Truffles?
Where Would You Find Truffles? If you want to sound extremely clever you can confuse your friends by telling them that the real name for truffles is Ascomycetes....
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What Is a Particle Accelerator?
What Is a Particle Accelerator? A particle accelerator is a machine that uses electromagnetic fields to propel charged particles to nearly light speed and to contain...
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