Montana State University

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Caption MSU professor David Ward (center) explains to program host David Pogue (left) how life worked before oxygen was part of the atmosphere. Ward is holding a drinking straw that contains a sample from a microbial mat in Yellowstone National Park. The mat lies between the men and the sampling boxes. Ward and Pogue are filmed by Gary Henoch, director of photography for Powderhouse Productions.(Photo courtesy of Powderhouse Productions).
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