We've been testing Android 6.0 "Marshmallow" for months, but Google has saved some of its more interesting features for today's big Nexus launch event. Most intriguing is the operating system's bigger focus on voice interactions: Google Now voice commands work a lot faster than before, and you can now also control apps with your voice. For example, asking Android Marshmallow to "Play NPR" pops up the NPR One app, which prompts a follow-up question about what specifically you'd like to hear. Any developer will be able to plug in similar "hands free" voice features in their apps. Both Google and Apple have been racing to add more voice features to Android and iOS, respectively, but if developers actually warm up to the new voice commands, Google might once again have the leg up (sorry, Siri).