Frog Deaths Are A Harbinger of "Sixth Mass Extinction" on Earth

Frogs and other amphibians lived through several mass extinctions on Earth over the past 250 million years, surviving the dinosaur wipeout and the most recent Ice Age. But now, say scientists this week in the Proceedings of the National Academy of Sciences, all that is changing. Amphibians are going extinct in such… »8/12/08 6:00pm8/12/08 6:00pm