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motion picture, history of the — Introduction history of the medium from the 19th century to the present. Early years, 1830–1910 Origins The illusion of motion pictures is based on the optical phenomena known as persistence of vision and the phi phenomenon. The first … Universalium
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History of television — The Television technology can be divided along two lines: those developments that depended upon both mechanical and electronic principles, and those dependent only on electronic principles. From the latter descended all modern televisions, but… … Wikipedia
History of aspirin — The history of aspirin and the medical use of it and related substances stretches back to antiquity, though pure aspirin ( acetylsalicylic acid or ASA ) has only been manufactured and marketed since 1899. Medicines made from willow and other… … Wikipedia
History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… … Wikipedia
publishing, history of — Introduction an account of the selection, preparation, and marketing of printed matter from its origins in ancient times to the present. The activity has grown from small beginnings into a vast and complex industry responsible for the… … Universalium
March 2011 — was the third month of the current year. It began on a Tuesday and ended after 31 days on a Thursday. International holidays (See Holidays and observances, on sidebar at right, below) Portal:Current events This is an archived version of Wikipedia … Wikipedia
Economic Affairs — ▪ 2006 Introduction In 2005 rising U.S. deficits, tight monetary policies, and higher oil prices triggered by hurricane damage in the Gulf of Mexico were moderating influences on the world economy and on U.S. stock markets, but some other… … Universalium
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