Historical clue formulations

• Unit of corn or wisdom — 2025-03-17
• Ear lobe? — 2023-04-22
• Ear piece? — 2023-03-05
• Niblet — 2018-05-27
• Central part — 2009-03-18
• Heart — 2003-06-07
• Gist — 2001-01-25
• Essence — 2000-11-29
• Bit of truth? — 2000-03-15
• Part of an ear — 1998-06-05