Historical clue formulations

• Curiosity and Perseverance, for two — 2026-07-14
• Curiosity and Perseverance, e.g. — 2024-10-08
• NASA's Spirit and Opportunity — 2019-11-25
• NASA's Spirit and Opportunity — 2010-03-13
• Rolling stones — 1999-09-10
• Players without fixed positions — 1997-12-05