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EmbedVideo(5947, 482, 304); This is the first of two PBS NewsHour reports on hexavalent chromium, a chemical found in U.S. drinking water and the agency charged with regulating it. This report aired on March 13. There is…

The sheer amount of debris in low-Earth orbit is tipping space dangerously close to a cascade of hazardous collisions, scientists announced at a four-day international meeting on the subject this week. And there is an "urgent need" to…