Engineer Rebeca Hwang, a Ph.D. student from Stanford University, is working to strengthen Argentina's water co-ops and bring clean water to more people. CNET Download's Jessica Dolcourt, author of CNET News.com's "Engineering change" series, e-mailed questions to Hwang, who sent back her videotaped answers.
3 minutes 1 second
April 9, 2007 3:00 PM PDT
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