What Is a Rhinoceros’s Horn Made Of?
What Is a Rhinoceros’s Horn Made Of? The horn of the rhinoceros is a dermal one, meaning made from something much like skin. Skin is composed of collagen and elastic...
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Who Created the Original Work of Art on the Ceiling of Sistine Chapel?
Who Created the Original Work of Art on the Ceiling of Sistine Chapel? The Sistine Chapel is a large chapel within the Vatican in Rome, Italy. It is used by the Pope...
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How Many Stars Are There in the Universe?
How Many Stars Are There in the Universe? No one knows how many stars there are in the universe. We cannot see all the stars, much less count them. It is estimated that...
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What Is Glue Made Of?
Glue is a sticky liquid that can stick two or more things together. Glue can be made from plant or animal parts, or it can be made from oil-based chemicals. The first...
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Why Aren’t There Any Snakes in Ireland?
Why Aren’t There Any Snakes in Ireland? If you were to search the countryside of Ireland, you wouldn’t find any snakes. Legend tells us that Saint Patrick, the...
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How Are Diamonds Formed?
You may know that diamonds are crystals formed almost entirely of carbon. Natural diamonds are formed in dying volcanoes, where great heat and pressure act on the...
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How Does a Cylinder Lock and Key Work?
How Does a Cylinder Lock and Key Work? A cylinder lock is made up of a revolving metal cylinder. Five small pins fall down into the cylinder when it is locked. There...
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What Is the History of the Pen?
What Is the History of the Pen? When the ancient Egyptians wrote on their papyrus rolls, they used a sharpened reed dipped in dye. After paper was introduced, people...
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How Does Coral Grow?
How Does Coral Grow? Beneath the surface of the sea lie coral formations of many shapes and colors. The formations may look like branching trees tinted green or...
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How Does Frost Harm Plants?
How Does Frost Harm Plants? On cold winter mornings, feathery designs of ice may form on windowpanes and blades of grass. These icy crystals are frost. Frost kills...
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