Historical clue formulations

• Members of the Flat Earth Society, e.g. — 2023-08-31
• Naysayers — 2021-08-01
• They're not just skeptics — 2020-02-05
• One side of the climate change debate — 2016-10-30
• They just say no — 2003-03-21
• They say it isn't so — 1999-12-05
• "Nay" sayers — 1997-02-08