Historical clue formulations

• Brightness measurement of a sort — 2026-02-27
• Something to think about? — 2022-08-31
• Exam where 100 is not a perfect score — 2022-03-25
• Measure of brightness — 2014-12-11
• Mesa prerequisite — 2014-08-23
• Measure of brainpower — 2010-08-19
• Sharpness gauge — 2009-11-20
• Many people get 100 on it — 2008-07-26
• Grade school administration, maybe — 2007-12-23
• It might ask "What comes next?" — 2007-06-16
• *Measure of brightness — 2006-08-13
• Brainpower measurer — 2001-02-05