Fertilizer is crucial to agricultural production, but its increasing use is leaking nitrous oxide, an ozone-deteriorating gas, into the atmosphere. iStockphoto.com hide caption

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A hiker takes in a view of rock formations at Utah's Zion National Park that rise more than 3,000 feet above the canyon floor. Courtesy of Zion National Park hide caption

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The perfume from an Australian king spider orchid attracts several male wasps. Christian Ziegler/National Geographic hide caption

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Colonies of the transformed mycoplasma mycoides bacterium. J. Craig/Venter Institute hide caption

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