A golf course consists of 18 holes made up of a teeing ground, fairway, hazards, and putting green. Each hole varies in difficulty through grass length and bends in direction called doglegs. While 18 holes is standard, 9-hole courses can provide a full round by playing twice. The modern game originated in 15th century Scotland, though some trace it back to ancient Roman games. Michelle Wie is considered the best female golfer, having turned pro at age 16 after breaking several records as the youngest to qualify for tournaments. Equipment needed to play includes a golf cart, balls, bag, tees of different lengths, and clubs consisting of woods, irons, and putters.