To be clear, it’s hard to make videos that very young children can learn from. (Johnson’s doctoral adviser, Georgene Troseth, was part of the team that demonstrated this.) Children under 2 struggle to translate the world of the screen to the one they see around them, with all its complexity and three-dimensionality. That’s why things like Baby Einstein have been debunked as educational tools. Most important for kids under 2 is rich interaction with humans and their actual environments.