Science

NASA rover spies the first aurora at Mars that's visible to the human eye
NASA's Perseverance rover has detected the first aurora at Mars that's visible to the human eye. That's good news for future astronauts who can savor the view on the red planet. European and U.S. scientists reported Wednesday that the green aurora in the dusty Martian sky was generated by a solar storm and had three days' advance notice last year to set aside viewing time. 
U.S. halts cattle imports from Mexico, citing fears of flesh-eating maggot
The New World screwworm is endemic in parts of Latin America and the Caribbean — and its northward spread into Mexico has alarmed U.S. officials. It can kill a full-grown cow in one to two weeks. 
White House dismisses authors of major climate report
The Trump administration dismissed all the scientists working on the next National Climate Assessment. The report is the most comprehensive source of information about climate change in the U.S.