Get a glimpse of all the cool new features in Apple's latest operating system, macOS Sierra. Learn about the optimized storage features, find out how to enable picture-in-picture video, and discover advanced features (like Universal Clipboard) for interacting with iOS devices. Our resident Mac expert, Nick Brazzi, also offers a glimpse of the new features in the apps that come bundled with Sierra: Photos, Messages, and Notes. He also shows how to work with Siri on the desktop.