The original post: /r/askscience by /u/pog_irl on 2024-11-05 05:45:20.

As in, traits we had a significant number amount of people having that are now gone? Are there any population bottlenecks where they might have been eradicated just due to bad luck? Not necessarily positive, just things like hair, eye color etc. If every person with green eyes died today I would consider it an example of this.