[Editor’s note: this is an updated version of an article originally published in October 2023] Football’s world rankings are a convenient way of measuring the difference...
Dave Calhoun announced in March that he would step down at the end of the year, in the wake of the Alaska Airlines blowout. He will...
Astronomers have witnessed a supermassive black hole turning itself on. The object sits at the center of galaxy SDSS1335+0728, which had been unremarkable until December 2019....