Planet Read added subtitles to Bollywood music videos. Hundreds of millions of people now see these videos, eager to learn the words of their favorite videos and becoming literate along the way. They have also done extensive measurements of their impact and see real progress on advancing literacy. Another example of scale, South Asian style!
The team I met were working on multimedia literacy content as part of Bookbox, and were busy using Adobe products to deliver cool ways to learn to read.
They first created original visual story content, and then added different languages. In addition to a print book, they have multimedia content that animates the characters and adds audio narration.