What Were the First Mirrors?
What Were the First Mirrors? Probably the first mirror was the surface of a quiet pond. Our earliest ancestors must have noticed that they c
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Metal
Why Do I Get a Shock When I Walk Across a Carpet and Touch a Metal Doorknob?
Why Do I Get a Shock When I Walk Across a Carpet and Touch a Metal Doorknob? The tiny electric spark you get when you touch something made o
What Metals Are Quarters and Dimes Made Of?
What Metals Are Quarters and Dimes Made Of? U.S. quarters and dimes are made of three layers of metal bonded together. The core is copper, a
Why Do Dimes Have Ridges on Their Rims?
Why Do Dimes Have Ridges on Their Rims? You have probably noticed the ridges, or grooves, on the edges of such U.S. coins as dimes, quarters
Why Does Iron Rust?
The metal iron combines chemically with oxygen when there is moisture in the air, and the result is the reddish substance we call rust. Iron