How YouTube Took Over the American Classroom

American classrooms are awash with YouTube. One survey showed that 94% of teachers have used YouTube in their roles. A WSJ investigation reveals the business strategy behind Google’s push to bring the technology to schools and looks at how YouTube is affecting children. WSJ’s Shalini Ramachandran lays out her reporting, and Jessica Mendoza talks with a math teacher who has been wrestling with YouTube in his classroom.