Vagina

This study is just fascinating to me.

As a summary, they were studying the oral flora of newborns compared to the vaginal-rectal flora of their mothers, specifically looking at lactobacilli transmission through birth. Granted, it's an older study (1975) but still really freaking cool as far as I'm concerned! (Just in case you're wondering, there does seem to be a correlation at birth, but it's pretty much gone in the infant after 6 days.)

And when your choices for a paper are basically botulism, diptheria, tuberculosis, anthrax, tetanus, leprosy, listeria, or lactobacilli... the vaginal flora wins. If I have to read about something, at least let it not be deadly. (I already did that with oomycota and fish kills and plant blights and such.)