- As LA traffic slowed amid the pandemic, researchers gained new insight into air pollution November 30, 2021Car tailpipes spew out molecules of ammonia, a harmful air pollutant that can lead to thousands of premature deaths every year. New research shows that vehicles may produce a lot more of these emissions than federal and state regulators have believed.
- Floods Are Threatening a Treasure Trove of American Heritage December 1, 2021Water is seeping into storage rooms at the Smithsonian’s American History Museum. A fix appears years away.
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- NASA mission tests asteroid defense plan November 25, 2021NASA launched a spacecraft toward an asteroid, hoping to redirect it before it threatens Earth. Mark Strassmann has the details.