The picture-in-picture video mode in Apple's iOS 9 was practically tailor-made for watching TV while you get things done, and Hulu knows it. The streaming service has updated its iOS app with support for PIP viewing, letting you revisit Seinfeld at the same time as you check Facebook. This probably won't be the only major streaming service to welcome PIP with open arms -- c'mon, Netflix -- but it's definitely one of the most important.