Frogs go from male to female
When exposed to weed-killer chemicals, some male frogs develop female reproductive systems and the ability to lay eggs. Huh? The bizarre discovery was recently highlighted in a buzzy article from the Washington Post. In a study published on Monday, scientists concluded that the herbicide known as atrazine ("one of the most common man-made chemicals found in U.S. waters") can cause male frogs to become "so completely female that they can mate and lay viable eggs."

The study comes out of the University of California at Berkeley and has the potential to stir up the debate over what qualifies as a safe chemical. The lead researcher, Tyrone Hayes, says that atrazine "causes hormone havoc" by converting testosterone into estrogen.

The news that some male frogs are developing the ability to lay eggs sparked a slew of Web searches. This article from US News and World Report goes into more detail about the study and its implications