At a Glance February's precipitation displayed a stunning contrast in the United States.Parts of the Southeast had a record-wet February.Some cities have had their two or three wettest Februaries within the last few years.Meanwhile, parts of California had a completely dry February.That hasn't happened in San Francisco since the Civil War. February showed an incredible contrast in precipitation across the United States, from the waterlogged Southeast to suddenly bone-dry California. In the Southeast, it was one of the wettest Februaries...

At a Glance NO2 Levels Over China Typically Drop During the Lunar New Year Holiday.But this year, the NO2 levels did not increase after the holiday like they have in past years.NASA scientists say it is at least partly related to the economic slowdown following the outbreak of coronavirus. One of the effects of the new coronavirus sweeping the globe could be beneficial to the country where it began. Pollution monitoring satellites have detected , NASA scientists say. NASA and...

This before-and-after composite image shows the aftermath of a tornado that swept through Nashville, Tenn. Tuesday morning. (Top Image: AP Photo/Alex Carlson; Bottom Image: Google Earth) Shortly before 1 a.m. Tuesday morning, several tornadoes swept through Middle Tennessee, killing at least 22 and hospitalizing more than 200. Almost 50 buildings collapsed, but many more are damaged, including in areas like downtown Nashville. More than 73,000 homes and businesses were without power in four counties, according to the state emergency agency....