Swimming microbes monitor water quality

Miners used to rely on canaries to alert them to dangerous build-ups of gases. Now much smaller animals -- the smallest of all -- can warn of toxins in water supplies.

Tiny protozoa may hold key to world water safety

Right now, it looks a little like one of those plastic containers you might fill with gasoline when your car has run dry. But Scott Gallager is not headed to the nearest Mobil station. The Woods Hole Oceanographic Institution ...