Historical clue formulations

• ____ tube — 2022-06-05
• Nincompoop — 2019-12-29
• Imbecile — 2018-10-16
• Fool — 2017-03-05
• Ninny — 2014-01-25
• Fool — 2013-04-01
• Dumb cluck — 2011-04-19
• Numbskull — 2011-03-28
• *Doofus — 2010-03-02
• Idiot — 2009-10-27
• Half-wit — 2009-02-01
• Numbskull — 2007-01-01
• Ninny — 2005-07-27
• Nitwit — 2004-03-18
• Meathead — 2003-10-05
• Doofus — 2003-08-04
• Schmo — 2003-07-25
• Pinhead — 2003-04-16
• Numbskull — 2002-11-20
• Chucklehead — 2001-06-13
• Hardly a genius — 2000-02-28
• Simpleton — 1999-12-24
• Palindromic ninny — 1999-03-17
• Chucklehead — 1996-09-29
• Lamebrain — 1994-11-30