Historical clue formulations

• Primitive sorts — 2021-03-12
• Club owners? — 2020-06-13
• Troglodytes — 2011-04-29
• Neanderthals — 2004-09-19
• Fred Flintstone and others — 2002-12-16
• Neanderthals — 1995-11-15
• Alley Oop and Fred Flintstone — 1994-07-14