I’ve released as CC0 all the pictures I’ve created and shared on Wikimedia Commons. I’ve been thinking about doing this for a while; Aaron’s death and — more specifically — Nina Paley’s release of Sita Sings the Blues as CC0 have pushed me into doing it. I’ve encountered the same issues she has — people ask me for permission due to legal concerns when I don’t think they need to. In particular, my chemical structure of DNA diagram has been a popular item for textbooks.