What Is Radar?
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. Electromagnetic...
Read MoreWhat 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. Electromagnetic...
Read MoreWhen Was Rubber Discovered? Although the remarkable properties of the rubber tree were known to the Aztecs and other South American Indians, for perhaps a thousand...
Read MoreWhat 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 travel through the air in all...
Read MoreWhat Gives Opals Their Colors? The beautiful flashes of color given off by a precious opal as it is turned and viewed from different angles are caused by the various...
Read MoreThe Super Ball made its big bounce into the world in 1965. An extremely elastic ball known for its high coefficient of restitution. This curiously bouncy ball was...
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