Historical clue formulations

• Crows — 2022-02-13
• "Anything you can do I can do better" and others — 2013-11-17
• "Look, ma, no cavities!" and others — 2005-01-13
• Crows — 2000-05-14
• Toots one's horn — 1997-10-01
• Crows — 1994-10-28