Historical clue formulations

• "Who's interested?" ... or, phonetically, what four answers in this puzzle are vis-à-vis the answers next to them — 2024-10-24
• "So ... who wants in on this deal?" — 2022-05-13
• "So ... who's in?" — 2020-04-17
• "Who wants to step up?" — 2019-07-19
• Challenging question — 2013-03-23