What Gives Yellow Mustard Its Bright Coloring?
What Gives Yellow Mustard Its Bright Coloring? Bright yellow mustard you’re familiar with starts out as tiny seeds that are white, brown, or black. Those tiny...
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What Is Chalk?
Chalk is a soft, white limestone. The chemical composition is calcium carbonate with minor amounts of silt and clay. It was formed from the shells that belonged mostly...
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When Were Buttons First Used?
Nobody knows when buttons were first used, or by whom. Museums have in their collections bone buttons older than written history. The Greeks used gold disks as buttons...
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How Do Snails Get Their Shells?
Snails usually begin to grow their protective shells before they hatch. The common garden snail hatches from a tiny round egg. Hidden under the young snail’s shell is a...
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How Are Hailstones Formed?
How Are Hailstones Formed? Hailstones are balls of ice that fall from storm clouds. Hail is a type of precipitation, or water in the atmosphere. Hail starts out as...
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Why Do We See Stars When We Bump Our Heads?
Why Do We See Stars When We Bump Our Heads? The “Stars” we see if we receive a hard blow on the head are really a sensation of light caused by the nerves of the eye....
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How Fast Does the Earth Spin?
How Fast Does the Earth Spin? The Earth is like a big ball, and it spins so as to turn around once every 24 hours. This means the surface of the Earth is moving pretty...
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How Do Cavities Form in Teeth?
How Do Cavities Form in Teeth? Our teeth are covered with a sticky, slimy substance plaque that enables decay producing germs to cling to them. Shortly after eating...
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Why Do We Get Goose Bumps?
Goose bumps, also known as goose flesh or goose pimples, are caused by tiny muscles in the skin. These muscles are around each of the hairs that cover our body. When...
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What Is a Sloth?
What Is a Sloth? Sloths are slow moving animals that spend almost all their lives upside down. Sloths live in trees in the forests of Central and South America. They...
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