Historical clue formulations

• Excites — 2025-11-18
• Keeps burning, say — 2025-06-11
• Feeds — 2024-02-03
• Pumps up — 2023-03-11
• Encourages — 2022-02-27
• Gives fuel to — 2021-08-22
• Feeds, as a fire — 2006-02-06
• Stirs up — 2003-02-09
• Tends the furnace — 2001-04-15
• Feeds a furnace — 1993-12-27