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Jack Shephard - Wikipedia, the free encyclopedia
Dr. Jack Shephard is a fictional character on the ABC television series Lost played by Matthew Fox. Jack is the leader of the crash survivors. He is also a principal of the series ...
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Jack Stephens, Magic Circle Magician & Children's Entertainer ...
Jack Stephens, Magic Circle Magician & Children's Entertainer, Close up magic, Balloon Modelling, Puppetry and much, much more!

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Jack, mechanical device used to raise or otherwise exert a force on an object too heavy to deal with by hand. A common example is the car jack, which is used to elevate the end of a car by a system of ratchets, gears, and screws. A hydraulic jack makes use of pistons and liquids in order to raise weights.