Ben Knight, vice president of automotive engineering at Honda R&D Americas, reports on what manufacturers are doing to make cars more fuel-efficient as green vehicles penetrate the market. This article was published in the February 2010 edition of Scientific American.

"The Naked Truth": New findings point to the evolution of human hairlessness. "Better Mileage Now": New upgrades to the internal-combustion engine will enable cars to become more fuel-efficient. "Fixing the Global Nitrogen Problem": The devastating effects of nitrogen pollution and what the global community must do to decrease its effects. "The Prolific Afterlife of Whales": The carcasses of the largest mammals give life to unique ecosystems.

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"Sparrin' Words", by Hendrik Hertzberg; "J. D. Salinger", by Adam Gopnik; "Bearable", by Lillian Ross; "A Night at the Movies", by John Seabrook; "The Trafficker", by Patrick Radden Keefe; "The Patch", by John McPhee; and "Castle in the Air", by Paul Goldberger.