Historical clue formulations

• Stir up — 2026-02-08
• Provoke — 2021-04-05
• Provoke — 2020-09-06
• Stir up — 2020-05-20
• Provoke — 2019-01-01
• Spark — 2017-09-02
• Stir — 2015-11-06
• Spark — 2014-09-13
• Provoke — 2011-07-21
• Be a catalyst for — 2008-11-07
• Stir — 2001-07-20
• Push — 2000-04-29
• Stir up — 1997-07-12