From asteroids the size of football stadiums to nuclear war and man-made pandemics, it can seem as if humankind is in ...

A contagious new COVID-19 variant called NB.1.8.1, aka "Nimbus," is now dominant in the United States, CDC data show. What to know about symptoms and vaccines.

A case in which more than 200 kindergarten students in northwestern China were found to have abnormal blood lead levels is ...