Q&A: Chris Groves – Exploring Underground Water Systems in Mammoth Cave

Renowned cave explorer Dr. Chris Groves goes deep into Mammoth Cave to see how torrential rainfall above affects underground rivers and ancient passages.

Sudan’s Fight Against the Guinea Worm

The Guinea worm has the potential to become the second completely eradicated disease in human history—but the political stability of one African nation will play a crucial role.

One in Five US Water Treatment Systems Contained Illegal Chemicals, Study Finds

Senate hearing focuses on EPA's efforts to protect the nation's drinking water. The water for more than 49 million Americans has been contaminated with illegal concentrations of dangerous pollutants since 2004.