How Was the Controlled Use of Fire Discovered?
How Was the Controlled Use of Fire Discovered? According to the Greek mythology, Prometheus stole fire from the gods and gave it to humans. Many Native American...
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What Are Basic Inventions?
Man has made thousand of inventions, but only a few are really basic. Basic inventions are those that lead to a change in the manner of man’s life on the planet Earth....
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What Is the Harlequin Ichthyosis?
What Is the Harlequin Ichthyosis? Harlequin ichthyosis is a severe genetic disorder that mainly affects the skin. Infants with this condition are born with very hard,...
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Can Two People Have Identical Fingerprints?
Can Two People Have Identical Fingerprints? If there is one thing in the world you have that nobody else has, it’s your very own fingerprints. See the loops and...
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How Do Eyeglasses or Contact Lenses Correct Our Vision?
How Do Eyeglasses or Contact Lenses Correct Our Vision? If your eyes did not do their job, your eyesight would be fuzzy and blurred. People who have imperfect eyesight...
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Which Is the World’s Largest Lake?
Which Is the World’s Largest Lake? Imagine a lake almost as big as the entire state of California. That’s the size of the Caspian Sea. It is the largest lake in...
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Do All Other Creatures Use Tools?
Do All Other Creatures Use Tools? Man was not the first of the creatures on earth to use a tool. Tools are used by animals to perform behaviors including the...
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What Is Clay?
Clay is a special kind of earth. It is made up of the smallest particles of rock, tinier than those in most other kinds of soil. The minerals that make up ordinary clay...
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What Makes a Bell Ring?
What Makes a Bell Ring? A bell is like a metal cup with a clapper hanging inside. When the clapper strikes the bell, the bell vibrates rapidly. (If you gently put your...
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How Does a Spider Spin Its Web?
How Does a Spider Spin Its Web? A spider spins a web out of silk that it makes inside its body. The silk comes out in thin liquid threads that harden when exposed to...
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