From Jenna Orkin Federal officials investigating after pro-Iran group allegedly hacked water authority in Pennsylvania Meet Greg Abel, Warren Buffett's successor and heir apparent to Berkshire Hathaway FBI NICS completed 214,913 background checks on “Black Friday” alone. That is the highest figure recorded for a “Black Friday.” Drug designed to extend dogs' lives takes major step toward FDA approval Classified: The Secret Radiation Files U.S. alleges plot to kill Sikh separatist directed by Indian government employee In Russia, the shift in public opinion is unmistakable A plane fueled by fat and sugar has crossed the Atlantic Ocean How Jensen Huang’s Nvidia Is Powering the A.I. Revolution The Southern Hemisphere is bracing for record-breaking heat during its upcoming summer.