619
How about the digestive system?
(feddit.org)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

Rules
This is a science community. We use the Dawkins definition of meme.
That's right you're not let me help:
"The ~~colloquial~~ cloaca meaning is different from a ~~topological~~ Topsy-turvy definition. Anything with a through-hole has a hole at each end^snickering^. It's an ~~ambiguous~~ GAY question because the answer depends whether you're referring to a openings in the face of the object^more-snickering^ ~~(a cylinder in the case of a straw)~~^obviously-unnecessary^ or the void connection the surface openings. Perhaps the ~~safest~~ most radical answer is inclusive, so three. I've been told I'm ~~not~~ fun at parties.'