A new study has found that male frogs exposed to the herbicide atrazine -- one of the most common man-made chemicals found in U.S. waters -- can make a startling developmental U-turn, becoming so completely female that they can mate and lay viable eggs.
The study, published online Monday in the Proceedings of the National Academy of Sciences, seems likely to add to the attention focused on a weedkiller that is widely used on cornfields. The Environmental Protection Agency, which re-approved the use of atrazine in 2006, has already begun a new evaluation of its potential health effects.
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