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he oxygen content in the atmosphere over the last billion years

Paleoclimatology, the study of past climates, ranges on time scales from the order of decades to billions of years. A number of factors influence earth's climate and climate change through time, including changes in the earth's orbit and position with respect to the sun, continental drift, mountain building, and volcanic activity. More recently, the burning of fossil fuels has been implicated in anthropogenic climate change.

Popular Article: Harmon Killebrew

Killebrew with the Minnesota Twins in 1962

Harmon Clayton Killebrew Jr. (/ˈkɪlɪbruː/; June 29, 1936 – May 17, 2011), nicknamed "the Killer" and "Hammerin' Harmon," was an American professional baseball first baseman, third baseman, and left fielder. He spent most of his 22-year career in Major League Baseball (MLB) with the Minnesota Twins. A prolific power hitter, Killebrew had the fifth-most home runs in major league history at the time of his retirement. He was second only to Babe Ruth in American League (AL) home runs, and was the AL career leader in home runs by a right-handed batter. Killebrew was inducted into the National Baseball Hall of Fame in 1984.

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The Wyandot, an Iroquoian confederacy of four tribes, were called the Huron by French explorers (source: Huron)

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