Been off the radar here since July, I apologize for that. I have to admit that it is difficult for me to stay consistent with community platforms and curate them. Although I would love to and know about the power of a thriving group of people focused on the same interest topic. I'll need to figure out how to go forward. But until so....here more amunition from the research area: A Stanford team around Susan Athey ran a randomized trial with about 10,000 Indian schoolkids on a reading app. Half the schools got a three month reading contest: leaderboard, book prizes for the top 1,000. Classic points and prizes. My expectation would have been a spike during the contest and a crash below baseline once the prizes are gone. That is the crowding-out story I have told for years. Twelve weeks after the contest ended, the contest kids were still reading more than the others. Roughly 0.7 stories per child versus 0.4, and the share of active users went from 6.5 to 9.6 percent. Small absolute numbers, real difference, and it held for kids who never won anything. So the prize does not seem to be what persisted. Something else did, maybe a routine, maybe the discovery that the stories were worth reading once the contest had pushed them to open enough of them. The contest was the excuse, the habit was the residue. Which moves the design question somewhere I did not expect: not whether to use a contest, but what is left behind when you take it away. Have you seen a reward mechanic leave a useful residue? Or the opposite, a crater?