Historical clue formulations

• One might sense bitterness — 2019-05-10
• It could be on the tip of your tongue — 2018-03-09
• It may be on the tip of your tongue — 2015-03-29
• Gustatory sensor — 1998-08-16
• Sensory device — 1995-04-28
• Flavor sensor — 1994-08-04