The life of billionaire Facebook executive and "Lean In" author Sheryl Sandberg has been distilled into a 32-page comic book set for release this week.
Emissions of greenhouse gases are rising so fast that within one generation the world will have used up its margin of safety for limiting global warming.
Google said it would beef up encryption of its mobile operating system, so that it would not hold "keys" to devices even if it is served with a warrant.
Barack Obama condemned what he called Russian "aggression" in Ukraine as he welcomed counterpart Petro Poroshenko to the White House for the first time.