this post was submitted on 10 Oct 2024
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7, if the cut-off is 60 microns (tear ducts). Smaller than that, we're essentially Swiss cheese.
Tbh, I was kinda hoping for someone with better biology knowledge than me to correct me. Thanks.
What are the the 7?
Important note, if you take a straw that separates into two split straws (kinda in a "Y" shape) that from a topological point of view is two holes, because one is for one of these paths, and the other is an extruded hole on the side of the first path. In topology you can't break or mend material, but you can pull, stretch, squeeze and move it all you want. So you can move one of the split straw "legs" to the bottom of the whole straw, getting a shape similar to a "V", it would look pretty much like a pair of pants. And topologically speaking it would be exactly the same. So... One straight hole for your mouth all the way down to your anus. Another two are there for your nostrils, that's 3 already. The rest are for your tear ducts, which have two holes on the edge of your eye, (so four in total) which merge and then connect to your nose.
So a human, from a topological perspective, is just a seven holed doughnut. Also Vsauce made a great video about that, with pretty great animations.