Historical clue formulations

• Question that casts doubt — 2024-07-18
• Second-guesser's question — 2024-04-20
• "Are you sure about that?" — 2024-01-04
• Question that introduces doubt — 2021-12-11
• Question that introduces doubt — 2021-02-28
• "... you sure about that?" — 2019-07-25
• Question that leaves an opening for doubt — 2015-04-28