When Does a Car Use Overdrive?
When Does a Car Use Overdrive? A car uses overdrive when it is traveling at high speed over long distances. Overdrive, or cruising gear, is a device which enables the...
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When Was the Hydrofoil Invented?
When Was the Hydrofoil Invented? The hydrofoil, a boat supported clear of the water by underwater wings called hydrofoils, was invented by an Italian, Enrico...
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What Are Gamma Rays?
What Are Gamma Rays? Gamma rays are streams of electromagnetic waves. They are given off from elements such as radium, when they undergo a process known as radioactive...
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What Is Muscle?
What Is Muscle? Muscle is the body tissue which, because it has the power of contraction, enables the higher animals to move their bodies. Muscles are divided into two...
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Why Do Penguins Have Small, Stiff Wings?
Why Do Penguins Have Small, Stiff Wings? A penguin wing is called a flipper. It is a hard, rigid paddle covered with tiny stiff feathers that are not waterproof (unlike...
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