When Were Tennis Shoes Invented?
Tennis shoes actually go by many different names: sneakers, athletic shoes, trainers, etc. The word was already in use at least as early as 1887 when the Boston Journal...
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What Are Stilts Used For?
Stilts are one of two long pieces of wooden poles, with places to rest your feet on, on which you can walk far above the ground. People strap it to their feet and walk...
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Plane and Simple
A boy who is three feet tall puts a nail into a tree at his exact height. He returns two years later when he has grown by six inches and the tree has grown by twelve...
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Why Are the Ibex so Good at Climbing?
The ibex also known as the the Alpine ibex, steinbock, bouquetin, is a species of wild goats living in rocky or mountainous regions from Spain to Mongolia. They migrate...
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Why Do Clouds Vary in Shape?
Clouds vary in shape according to their height and temperature, and they contain minute drops of water or ice particles or a combination of both. And, of course, their...
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