A Cheap Test for Potable Water

According to the World Health Organization, 2.1 billion people do not have access to safe drinking water. Many of them rely on wells and streams, making testing the water for bacterial contamination of crucial importance. However, cheap and reliable testing equipment is often not available or not affordable. Scientists in Britain and elsewhere are working on a simple, paper-based test that can confirm that water is safe in a matter of seconds. VOA's George Putic reports.