On [Chemistry.SE][1]: ![enter image description ][2] These are all Community ♦ bumps, separated by exactly one hour (They occur on `hour`:38:16 UTC). Could the bot be sedated please? We're a 4-questions-per-day site; a bump an hour is not good for business. We used to have one bump per day. This is evident if you scroll down on the homepage and check the timestamps ([screenshot][3]). Apparently the number of questions bumped per hour is a [configuration value][4]. Maybe this got tweaked? [1]: http://chemistry.stackexchange.com/ [2]: https://i.sstatic.net/QsOQd.png [3]: https://i.sstatic.net/MshhE.jpg [4]: http://meta.stackoverflow.com/questions/48578/what-can-cause-my-question-to-be-bumped/48579#comment112509_48579