Historical clue formulations

• Thoughtful types — 2025-02-15
• Think tank types — 2012-11-28
• They're highly reflective — 2010-03-06
• Madison Avenue types — 2008-02-09
• Ones paid to conceive? — 2007-10-26
• People known to have germs? — 2004-07-02
• Professional light bulb producers? — 2003-11-08
• Think tank types — 2001-11-01
• Creative types — 1997-05-31