Historical clue formulations

• What makes you question everything you know? — 2022-08-19
• Popular program usually shown back to back with 34-/36-Across — 2018-09-24
• Show that once had an April Fools' Day episode hosted by Pat Sajak — 2018-07-28
• Game show with the theme music "Think!" — 2014-03-26
• Hazard — 1994-03-30