Historical clue formulations

• Nitwits — 2024-07-06
• Extinct birds of Mauritius — 2023-12-26
• Pinheads — 2017-02-24
• Dummies — 2017-01-24
• Meatheads — 2016-08-14
• Dim bulbs — 2016-07-15
• Dummies — 2016-03-12
• Dummkopfs — 2016-01-06
• Boneheads — 2013-05-08
• Rattlebrains — 2010-04-29
• Numbskulls — 2006-04-06
• Dummies — 2005-09-28
• Dim bulbs, so to speak — 2004-07-07
• Dumbbells — 2003-12-22
• Dummies — 2003-06-24
• Extinct flock — 2003-06-02
• Grounded birds — 1999-08-24
• Geniuses they're not — 1999-06-09
• Blockheads — 1999-02-11
• Dummies — 1998-05-17
• Idiots — 1998-03-12
• Noodleheads — 1995-10-29