Astrophysicist Neil deGrasse Tyson explains the importance of water in finding life on other planets and the impact of Gliese 581's discovery.
Nov. 19: Green Ice Core: An international team of scientists are drilling deep into the past to learn what our future may hold. NBC's Anne Thompson reports.
The Baltimore Waterfront Partnership involves the community in building little islands to help clean up the water and create wildlife habitat. NBC's Lea Sutton reports.
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