Via
the_siobhan:
Detailed, close-up images of a woman's cervix over every day of her menstrual cycle. (NSFW, obviously.) This will be especially interesting to those of you on my FL who are involved in birth work or who are educated about their fertility cycle (which covers most of the females on my FL).
If you don't know anything about how a woman's cervix and cervical fluid change during her cycle, I'd strongly recommend checking this out. :)