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He has authored more than 50 scientific publications and seven texts, including "BIOLOGY" (with botanist Peter Raven), "THE LIVING WORLD" and a widely used high school biology textbook, "HOLT BIOLOGY." As the founding director of The Living World, the education center at the St Louis Zoo, from 1987 to 1990, he was responsible for developing innovative high-tech exhibits and new educational programs

As the engine cooled from inactivity, and as the aircraft descended out of the ash cloud, the molten ash solidified enough and broke off for air to again flow smoothly through the engine, allowing a successful restart

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Finally, smoking has also been associated with an increased risk of erectile dysfunction