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Tennis is a sport usually played between two players (singles) or between two teams of two players each (doubles). Each player uses a racket that is strung to strike a hollow rubber ball covered with felt over a net into the opponent's court. The modern game of tennis originated in the United Kingdom in the late 19th century as "lawn tennis" which has close connections to various field/lawn games as well as to the ancient game of real tennis...

Black-and-white colobus are Old World monkeys of the genus Colobus, native to Africa, and are closely related to the red colobus monkeys of genus Piliocolobus. The word "colobus" comes from Greek ekolobóse "he cut short" and is so named because its thumb is a stump. Baby colobus are born completely white. Colobus are herbivorous, eating leaves, fruit, flowers, and twigs...

A mountain is a large landform that stretches above the surrounding land in a limited area usually in the form of a peak. A mountain is generally steeper than a hill. The adjective montane is used to describe mountainous areas and things associated with them. The study of mountains is called Orography. Exogeology deals with planetary mountains, which in that branch of science are usually called montes (singular—mons). The highest mountain on earth is the Mount Everest 8,848 m (29,029 ft)...

The United States dollar (sign: $; code: USD) is the official currency of the United States of America. The U.S. dollar is normally abbreviated as the dollar sign, $, or as USD or US$ to distinguish it from other dollar-denominated currencies and from others that use the $ symbol. It is divided into 100 cents. The U.S. dollar is the currency most used in international transactions and is one of the world's reserve currencies...

The Misa digital guitar is a new instrument, similar to an electric guitar in shape, but with an interface designed to easily and intuitively control digital audio. Most musicians today use some form of audio synthesis or sampling in their music. Virtually any type of sound can be created using these methods. Traditionally, digital piano keyboards have been the dominant instrument for controlling these sounds real-time in a musical setting...