Monthly Archives: July, 2012

How do gliders fly?

Gliders soar across the sky by riding on air currents. Airplanes without engines are called gliders.  They are very light, with long, slender wings. A glider can glide downhill on air.  It also can soar  upward on rising wind and heat currents in the air. These updrafts are caused by warm air that rises upward …

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When did dentistry begin?

The first school for dentists was founded in 1840. Dentistry, the art and science of treating disease of the teeth and the parts of the mouth, is rather new. There were no real dentists with about 250 years ago.  But people needed dentists for many centuries before that. In ancient times, there was not too …

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What makes the wind blow?

Wind is caused chiefly by the uneven heating of the earth by the sun. All winds, from gentle breezes that rustle leaves to raging hurricanes, are caused chiefly by the uneven heating of the earth by the sun. When the air near the ground gets hot, it expands or swells.  This makes it lighter, and …

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Where do cloves come from?

Cloves are the dried, unopened flower buds of the tropical clove tree. The  spicy cloves your mother uses when she bakes ham come from the dried flower buds of the clove tree, an evergreen tree which grows in the Spice Islands and some other tropical lands. Cloves look much like little nails.  In fact, the …

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How does a radio work?

A radio changes the radio waves sent out by a broadcasting station back into sound waves that we can hear. When you listen to a radio, you may wonder how the sounds get to your radio from the broadcasting station. The answer is that your radio picked up the sounds in the form of radio …

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How did the navel orange get its name?

The navel orange gets its name from the small second fruit, resembling a navel, embedded in one end of the main fruit. You will know the navel orange by its bright golden color and by the curious formation, like a tiny orange, growing at the end opposite the stem. The navel orange is really two …

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Why did pirates fly the Jolly Roger flag?

Because piracy is against the laws of all countries, pirates in the past flew the flag of no nation, but defiantly flew their own flag—the Jolly Roger. Pirates have always fascinated many people.  They love to read tales of Blackbeard, Captain Kidd, and other bold and wicked pirates. Pirates of long ago swarmed over merchant …

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Where do fruit flies come from?

The tiny fruit flies, or vinegar fly is often found around rotting fruit and vegetables. If you should forget to pick up a banana peel or an apple core, in a few days you might see tiny, red-eyed flies which seem to have appeared as if from nowhere, hovering over the rotting fruit. These tiny …

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Who was Aesop?

According to legend, Aesop was a Greek author of fables in which animals acted like people.  Each story taught a lesson. Perhaps you know the stories about the goose that laid the golden egg, the lion and the mouse, or the tortoise and the hare. According to legend, these and many other well-loved fables were …

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What does the sawfish use its saw for?

The sawfish uses its saw like snout mainly to attack other fish to catch its food. A sawfish looks like a big shark with a long, flat, saw like snout. The “saw” of an adult sawfish is often 5 feet long, and is armed with sharp feet.  The sawfish uses its saw like snout mainly …

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