In the first-of-its kind, save-the-world experiment, NASA is about to clobber a small, harmless asteroid millions of miles away.A spacecraft named Dart will ...

Secretary-General Antonio Guterres delivered his “state of the world” speech at Tuesday’s opening of the annual high-level global gathering. U.N. spokesman Stephane Dujarric said it would be “a sober, substantive and solutions-focused report card” for a w...