IDEA: "where are they now?" but for big splash papers published in 2000s.
Would be good to i) celebrate breakthroughs that kicked off a rich line of research, ii) follow "what happened next" for papers that weren't quite correct, iii) acknowledge that some big splash papers were ultimately squibs that went nowhere.
Probably you could find examples of all three in a single issue of Nature from 20 years ago. Could be a good exercise with a postgrad class.