Note on Illustrations in This Blog

A rare administrative note: I like well-illustrated sources.  I don't use as many illustrations in this blog as I'd like to, though.  I'm not criticizing anyone else's approach, but I'm a writer, and I don't like my copyrighted material used without permission, so I extend the same courtesy to artists and photographers.  I wrote on this subject for the National Association of Science Writers and also researched and taught it in my "day job" consulting firm classes. So I avoid illustrations from private websites or commercial media sources unless I have permission or know they are not copyrighted, and I read "Fair Use" narrowly since this blog does serve the commercial purpose of promoting my books along with being educational.  These folks at Copyright Clearance Center are the experts.