The research team used yeast chromosome No. 3 as the model for their biochemical stitchery. Pins and white diamonds in the illustration represent "designer changes" not found in the usual No. 3; yellow stretches represent deletions. Lucy Reading-Ikkanda hide caption

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Your schnoz deserves more respect. epSos .de/Flickr hide caption

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A channel big enough to handle global shipping would require deep dredging throughout Lake Nicaragua, the largest source of fresh water in Central America. Esteban Felix/AP hide caption

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Until recently, finding characteristic stone and bone tools was the only way to trace the fate of the Clovis people, whose culture appeared in North America about 13,000 years ago. Sarah L. Anzick/Nature hide caption

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Clive Hamilton's new book Earthmasters. Courtesy of Yale University Press hide caption

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The Climate Casino by William Nordhaus looks at the economics and politics of global warming. Courtesy of Yale University Press hide caption

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Massive sections of ice (center front) have broken away from the Jakobshavn glacier into the sea. There's enough water stored in Greenland's glaciers to raise the sea level by 20 feet. Ian Joughin/Science/AAAS hide caption

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Love your hair. Artists' depictions of a Neanderthal man and woman at the Neanderthal Museum in Mettmann, Germany. Martin Meissner/AP hide caption

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Each year, 6 to 8 percent of the global population of sharks and rays gets caught, scientists say. The fish can't reproduce fast enough to keep pace Mike Johnston/Flickr hide caption

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A sperm whale entangled in a drift net. A report says commercial fisheries around the world kill or injure 650,000 mammals a year. Alberto Romero/Marine Photobank hide caption

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