Прочтите тут:http://ru.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B7%D0%BC%D0%B5%D1%80_%D0%BC%D1%83%D0%B6%D1%81%D0%BA%D0%BE%D0%B3%D0%BE_%D0%BF%D0%BE%D0%BB%D0%BE%D0%B2%D0%BE%D0%B3%D0%BE_%D1%87%D0%BB%D0%B5%D0%BD%D0%B0и успокойтесь уже...