Does a Spider Ever Get Caught in Its Own Web?
Does a Spider Ever Get Caught in Its Own Web? It is unlikely that spiders get caught in their own webs. Spiders build webs to trap insects for food. A spider’s...
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What Is the Longest River in the World?
What Is the Longest River in the World? The Nile River is the world’s longest river. It flows more than 4,160.08 miles (6,695 kilometers) from its source in...
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Why Do Cats Retract Their Claws?
Why Do Cats Retract Their Claws? Cats retract their claws in order to keep them sharp for catching mice and other prey. A cat has a special movable joint at the end of...
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Who Invented the Bicycle?
Who Invented the Bicycle? In 1817, Karl Drais von Sauerbronn invented the first bicycle named the “Laufmaschine”. He invented his bicycle as an alternative...
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When Does a Hill Become a Mountain?
When Does a Hill Become a Mountain? There is no exact rule that indicates when a hill becomes a mountain. But scientists who study the surfaces of the Earth usually...
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