Historical clue formulations

• Lecture series with "Ideas worth spreading" — 2024-12-04
• Online lecture franchise — 2024-04-05
• "Ideas worth spreading" spinoff — 2023-05-07
• "Ideas worth spreading" offshoot — 2022-12-25
• Lecture series focused on "ideas worth spreading" — 2021-03-03
• "Ideas worth spreading" offshoot — 2019-09-01