Engel v. Vitale, 370 U.S. 421 (1962), was a landmark United States Supreme Court case that ruled it is unconstitutional for state officials to compose an official school prayer and encourage its recitation in public schools.
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Because of his hard work.
Checks and balances help balance the U.S. government power (the three branches). Each branch's powers are kept in check by the powers given to the other two branches.
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The modern uses of radar are highly diverse. including air and terrestrial traffic control, radar astronomy, air-defense systems, antimissile systems, marine radars to locate landmarks and other ships, aircraft anti collision systems, ocean surveillance systems, outer space surveillance and rendezvous systems. radio waves, being just a specific slice of the light (EM) spectrum, can travel through space just fine. Actually, light travels slightly faster in space than in air. It travels at the cosmic speed limit. They can be used to detect obstacles in a distance of around 30 meters and measure their speed. They are placed in bumpers or on the sides of a vehicle and warn about possible collisions with objects or persons. In addition, they can be used to support the parking process.
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