What Is a Solar Panel?
What Is a Solar Panel? A solar panel consists of a group of photovoltaic cells linked together. As their name suggests, these cells convert light (“photo”)...
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What Is Paint Made From?
What Is Paint Made From? Ordinary house paint gets its color from colored powders called pigments. Pigments can come from ground-up rocks, or coal, or tar, or chalk and...
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What Causes the Common Cold?
What Causes the Common Cold? Common colds are caused by tiny organisms called viruses, which infect the mucous membranes of the nose and throat. These viruses are...
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How Did We Get Our Letter W?
How Did We Get Our Letter W? The letter W developed from a symbol used by the ancient Semites, who lived in Syria and Palestine. They named it “waw,”...
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Why Is Sandalwood so Valuable?
Sandalwood is valuable because it is rare. The wood actually comes from a number of species of trees that can be found only in southern India, Indonesia and Australia....
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Where Do Wasps Get the Paper They Use to Build Their Nests?
Where Do Wasps Get the Paper They Use to Build Their Nests? Paper wasps, build small, umbrella-shaped nests under eaves and overhangs. They actually make their own...
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What Is Foster Care and Why Is It Necessary?
What Is Foster Care and Why Is It Necessary? The word “foster” means helping someone grow and develop. In the United States, the foster care system seeks to...
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What Is Asperger’s Syndrome?
Asperger’s syndrome also called Asperger’s disorder was named for the Austrian doctor, Hans Asperger, who first described the disorder in 1944. However, it...
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How Do I See?
How Do I See? You see with your eyes, but also with your brain. There are many different parts of the eye that help to create vision. First, waves of light strike...
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Can You Get Warts from a Toad?
Can You Get Warts from a Toad? No. Touching a toad has nothing to do whatsoever with the cause of warts. This belief is just superstition. The rough skin of a toad...
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