> ## Content Index
> Fetch the complete content index at: https://www.cascadepbs.org/llms.txt
> Use this file to discover other available public pages before exploring further.

# Darwin's Unexpected Final Obsession
- URL: https://www.cascadepbs.org/show/eons/episode/darwins-unexpected-final-obsession-yfc9pm/
- Published: 2025-06-04T16:30:51.000Z
- Updated: 2025-08-20T13:46:33.000Z
- Description: What was Charles Darwin really obsessed with?
- Author: Cascade PBS Staff
- Tags: Eons, Season 7, Episode 21, #ZZZ_Episode_7984ae6c-ce59-44e0-af3b-6362546d5f93, #episode, #ZZZ_Show_097a92b5-f8ed-4727-9486-f3b9368ac0ef, #geo-us, #v1.16

After having solved the small matter of evolution by natural selection - becoming one of the most famous scientists in the world in the process - Charles Darwin turned his focus to a different personal obsession…