The last Open Thread was in October 2017, so I thought we were overdue for a new one.
Use this thread to post things that are awesome, but not awesome enough to be full posts. This is also a great place to post if you don't have enough karma to post on the main forum.
Consider giving your post a brief title to improve readability.
Forum searching tip
Searching the forum by typing "site:effective-altruism.com [your search query]" into the URL bar gives you more results - including some very relevant ones - than using the built-in search bar on the top-right of the forum itself (at least for me).