How is this a hack? This is ridiculously old psychology. Here's the same "hack" from the 50's: https://en.wikipedia.org/wiki/Jigsaw_%28teaching_technique%2...
Just because people on the san francisco tech startup echo chamber news site aren't familiar with it doesn't make it novel, clever, etc..
Or should I just post the jigsaw classroom wikipedia link or a link to the original paper and rake in the upvotes?