“Sesame Street has more than 5 billion views on YouTube … but ChuChu has more than 19 billion. Sesame Street‘s main feed has 4 million subscribers; the original ChuChu TV channel has 19 million — placing it among the top 25 most watched YouTube channels in the world.” Alexis Madrigal travels to ChuChu headquarters in Chennai to find out how they do it — and talks to a scholar of children’s media about the pluses and pitfalls of their style of video.