One thread of the recent artificial intelligence revival is crafting fakes that look and sound convincingly real, such as reproductions of paintings by known artists. Researchers at Facebook's Oculus research lab, and colleagues at Carnegie Mellon, have developed neural networks that create fake videos showing what it would be like if one person spoke in the manner of another person, or videos of a cloudy day in a place where there were actually clear skies in reality. The product of all this are videos that could be unsettling or thrilling, depending on your perspective: Comedian John Oliver's original monologue can be made to craft a new, fake sequence of video by fellow comedian Stephen Colbert, translating Oliver's expressions and mannerisms onto the likeness of Colbert. The phenomenon, known as "retargeting," has been explored for years, mainly with still images. The new research promises to refine visual fakes by employing more of the clues provided by the moment-to-moment shifts of frames in a video.