PBS
Pbs Learning Media: Earth Water Filter
In this video segment adapted from ZOOM, cast members try to make the most effective water filter. They experiment with filtering dirty, salty water through different combinations of sand, gravel, and a cotton bandana. [4:54]
National Science Foundation
National Science Foundation: Cactus 'Flesh' Cleans Up Toxic Water
See University of South Florida engineering professor Norma Alcantar and her team are using the flesh from Prickly Pear cacti, called mucilage, to clean up oil and other toxins from water. [2:32]
PBS
Pbs Learning Media: Southern Africa: Troubled Water
In 2005, FRONTLINE/World featured the PlayPump, a promising new technology that pumped fresh water when children played on a merry-go-round. The story appealed to the good intentions of politicians, celebrities, and funders, who gave...