Laughing Gas: The Latest Threat to the Ozone Layer

Humankind doesn’t have a great track record when it comes to cleaning up environmental messes, but there was one time we really outdid ourselves. That was back in 1989, when over 190 nations signed the Montreal Protocol, phasing out the use of chlorofluorocarbons

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NASA releases clearest videos yet of 1969 moonwalk

NASA released newly restored videos Thursday of two U.S. astronauts taking the world’s first steps on the moon. The images were released just four days before the 40th anniversary of the historic event that captivated the world on July 20, 1969

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