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Researchers are testing what urine and other molecules can be turned into to help astronauts on a mission to Mars.
The Gulf of Mexico's "dead zone" measured in at more than 8,700 square miles — an area roughly the size of New Jersey.
A toxic algae that ravages animals' brains has been killing sea lions in California.
Crews continue to clean up green algae that has spread across Denver City Park's Ferril Lake.