А поисковиками вы пользоваться совсем не умеете?http://ru.wikipedia.org/wiki/%D0%9A%D1%80%D0%B0%D0%BF%D0%B8%D0%B2%D0%B8%D0%BD,_%D0%92%D0%BB%D0%B0%D0%B4%D0%B8%D1%81%D0%BB%D0%B0%D0%B2_%D0%9F%D0%B5%D1%82%D1%80%D0%BE%D0%B2%D0%B8%D1%87#.D0.91.D0.B8.D0.B1.D0.BB.D0.B8.D0.BE.D0.B3.D1.80.D0.B0.D1.84.D0.B8.D1.8F