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A visitor looks at a skeleton of a Simi Valley Mastodon beside a video describing how changes in the earth and climate effect the evolution of mammals, during the press preview of the "Age of Mammals" exhibition and the newly restored 1913 building  in which it is housed, at the National History Museum of Los Angeles County, July 8, 2010 in Los Angeles.  The "Age of Mammals", which opens to the public on July 11, is the first exhibition in the 97-year-old building since restoration work began five years ago. The USD $107 million dollar project included a major seismic strengthening. In the foreground is the head of a skeleton of a Teleoceras Fossiger, a hippo-like rhinoceros.  AFP PHOTO / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
A visitor looks at a skeleton of a Simi Valley Mastodon beside a video describing how changes in the earth and climate effect the evolution of mammals, during the press preview of the "Age of Mammals" exhibition and the newly restored 1913 building  in which it is housed, at the National History Museum of Los Angeles County, July 8, 2010 in Los Angeles.  The "Age of Mammals", which opens to the public on July 11, is the first exhibition in the 97-year-old building since restoration work began five years ago. The USD $107 million dollar project included a major seismic strengthening. In the foreground is the head of a skeleton of a Teleoceras Fossiger, a hippo-like rhinoceros.  AFP PHOTO / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)

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    Study sparks debate on North American history

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Study sparks debate on North American history

Analysis of mastodon bones found in San Diego has led a team of researchers to believe that human activity was present in North America 130,000 years ago.

Study sparks debate on North American history

Analysis of mastodon bones found in San Diego has led a team of researchers to believe that human activity was present in North America 130,000 years ago.