What Is Radar?
Radar, or radiolocation, as it was called in the early days, is the use of radio waves to find the whereabouts of aircraft or ships. Electro
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Bounce
When Was Rubber Discovered?
When Was Rubber Discovered? Although the remarkable properties of the rubber tree were known to the Aztecs and other South American Indians,
What Makes an Echo?
What Makes an Echo? An echo is a sound that we hear after it is reflected, or bounced back, from some object. When we shout, sound waves tra
What Gives Opals Their Colors?
What Gives Opals Their Colors? The beautiful flashes of color given off by a precious opal as it is turned and viewed from different angles
What Is a Super Ball Made of?
The Super Ball made its big bounce into the world in 1965. An extremely elastic ball known for its high coefficient of restitution. This cur