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Where Did the Dollar Sign Come From?
Where Did the Dollar Sign Come From? No one really knows where the dollar sign ($) came from. The probable explanation is that it…
What Makes a Knot in a Piece of Wood?
What Makes a Knot in a Piece of Wood? A knot in a piece of wood is simply a lump, or growth, formed at…
How Are Oysters Born?
How Are Oysters Born? Baby oysters are hatched from tiny eggs. A female oyster can lay as many as 70 million eggs a year.…
How Does Tape Recorder Work?
How Does Tape Recorder Work? The tape for a tape recorder is coated with tiny bits of iron. When you speak into a tape…
What Is Sea Level?
We say that Mount McKinley in Alaska is 20,320 feet above sea level, or that Death Valley, in California, is 282 feet below sea…