A windmill is a machine which converts the energy of wind into rotational energy by means of vanes called sails or blades. Originally windmills were developed for milling grain for food production. In the course of history the windmill was adapted to many other industrial uses. An important non-milling use is to pump water, either for land drainage or to extract groundwater with windpumps. Windmills used for generating electricity are commonly known as wind turbines.

The windwheel of the Greek engineer Heron of Alexandria in the 1st century AD is the earliest known instance of using a wind-driven wheel to power a machine. Another early example of a wind-driven wheel was the prayer wheel, which was used in ancient Tibet and China since the 4th century. It has been claimed that the Babylonian emperor Hammurabi planned to use wind power for his ambitious irrigation project in the 17th century BC.

The first practical windmills had sails that rotated in a horizontal plane, around a vertical axis. According to Ahmad Y. al-Hassan, these panemone windmills were invented in eastern Persia as recorded by the Persian geographer Estakhri in the 9th century. The authenticity of an earlier anecdote of a windmill involving the second caliph Umar (AD 634–644) is questioned on the grounds that it appears in a 10th-century document. Made of six to twelve sails covered in reed matting or cloth material, these windmills were used to grind grain or draw up water, and were quite different from the later European vertical windmills. Windmills were in widespread use across the Middle East and Central Asia, and later spread to China and India from there.

Carey Price (born August 16, 1987) is a Canadian professional ice hockey goaltender currently playing for the Montreal Canadiens of the National Hockey League (NHL). Price was the Canadiens' first round selection (fifth overall) in the 2005 NHL Entry Draft. Price spent his major-junior career with the Tri-City Americans of the Western Hockey League (WHL).

Before Price was drafted by the Montreal Canadiens, he established himself as a top prospect playing with the Tri-City Americans beginning in 2002–03. Price was particularly strong during his draft year in 2004–05, posting 8-shutouts, a 2.34 goals against average (GAA) and a .920 save percentage. In his last year in the WHL, he was awarded the Del Wilson Trophy as the WHL goaltender of the year and was named to the WHL First All-Star Team. He was also named CHL Goaltender of the Year.

Upon completing his award-winning season in the WHL, Price immediately began his professional career with the Hamilton Bulldogs of the American Hockey League (AHL), having signed with the Canadiens in 2007 to a three-year entry-level contract. He joined the Bulldogs for the last three games of the regular season and the 2007 Calder Cup Playoffs, recording his first professional game and win on April 13, 2007 against the Grand Rapids Griffins. He was named the first star of the game upon stopping 27 of 28 shots. Price went on to lead the Bulldogs to a 15–6 playoff record and the 2007 Calder Cup championship, posting an impressive 2.06 GAA and .936 save percentage. In his first game of the Calder Cup finals, he stopped all 46 shots to post a shutout. He subsequently won the Jack A. Butterfield Trophy as the Calder Cup playoffs MVP, making him the youngest player ever to receive the award.