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Mockingbirds quickly recognize repeat human intruders

People may have a tough time telling one squawking bird from another. Mockingbirds, on the other hand, quickly learn which humans to watch.

"Mockingbirds certainly do not view all humans as equal," Doug Levey, lead author of a study of published this week in Proceedings of the National of Sciences , said in a statement...

May 19, 2009 — Katherine Harmon

New fuel efficiency standards: Too much or not enough?

The Obama administration unveiled a plan to boost fuel efficiency standards for cars and trucks to an average of 35.5 miles per gallon by 2016—four years ahead of current schedule and up from an average of just 25 miles per gallon today...

May 19, 2009 — David Biello

Trees boost air pollution--and cool temperatures--in U.S. Southeast

Why is the southeastern U.S. getting cooler while the rest of the globe is warming? Thank the trees, say some researchers.

On sweltering summer days, trees and other plants emit volatile organic compounds, such as isoprene, which combine with manmade soot and other aerosols in the atmosphere to produce a cooling haze, says environmental scientist Allen Goldstein of the University of California, Berkeley...

May 18, 2009 — David Biello

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