Footballs have been made out of a variety of materials over the years, including bladders, [[https://www.cheapjerseyswin.com wholesale nfl jerseys]] hides, rubber, paint, leather and [[https://www.wholesalejerseyslan.com wholesale jerseys nfl jerseys from china]] string. According to Timothy Gay in "Football Physics: The Science of the Game," the shape of the ball is a prolate spheroid.
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