Slideshow: Testing the Waters: Fish or Foul?

Researchers faced with determining the safety of drinking water have a new approach: If you want to know the quality of the water, ask those who live there -- fish. By Louise Knapp.
Image may contain Electronics
Electrodes at the bottom of each fish chamber register gill movements and relay the information to a computer for analysis.Courtesy of William van der Schalie, Army toxicologist at the Center for Environmental Health Research

See related story: Testing the Waters: Fish or Foul?

Image may contain Luggage

The Army's Center for Environmental Health Research designed this cabinet to monitor water supplies for any sign of toxic material.

Courtesy of William van der Schalie, Army toxicologist at the Center for Environmental Health Research