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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.
A straw has one hole that is open to two entrances. Like a single tunnel. We never say that a tunnel has two holes.
A tunnel has two holes.
We mustn't say that. It is forbidden.
Christmas is just another form of control, from the matrix.
it pushes massive consumerism and the idea to kids must do as told to be "nice," cause we can watch them all the time like a cia state.
Is that less forbidden?
It is forbidden.
I got a T shaped cat tunnel. It's got two holes. I think. Topology can go suck a lemon
Still one hole unless there's isolated sections
Which is why I said SINGLE tunnel.