this post was submitted on 23 May 2025
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I'm really curious how you got that number? I guess eye sockets aren't counted, as topologically with how many of the tubes connect, it's probably something weird.
4 lacrimal ducts, 2 nostrils, 1 mouth and 1 anus = 8 interconnected holes. Subtract 1 (because a proper donut hole needs both an entrance and an exit) and you get 7.
I guess it could be argued that women have an extra hole, as there is a passage through each fallopian tube into the pelvic cavity.
Mouth/anus is just one hole since humans are doughnut shaped.
So we are really just a big cup?
donut != cup
https://en.m.wikipedia.org/wiki/File:Mug_and_Torus_morph.gif
In topography a donut and a cup are equivalent shapes.
cup != mug
You were making me doubting my english for a moment there. But no, a quick google search confirmed that a cup, like in a cup of coffee, is totally valid for my statement.
You should keep doubting your English, bro. A cup doesn't have a handle, a mug does. Without a handle, it's not a doughnut (topographically).
Imagine not knowing your own and only language.
If I made a mistake in one of the 5 languages I speak it would be something. But making these mistakes in the only language you are able to speak... That's something.
Imagine being such an arrogant prick that you can't just accept being wrong and move on with your life.
Later, chode.
But it leaves out the urethra
It's not a through-hole, because you can't insert a small object into it and have it come out of some other opening
Guess the object you are using is not small enough.
Use a water molecule and we are all sponges
I did consider that in a comment I wrote deeper in the thread, but if you put it like that, the concept of "hole" doesn't even make sense anymore
OP claimed there are 7 holes. Holes don't need an exit, and I'd like to know where you think inserting something into an orbit will naturally come out in a person you want to survive the experience.
If you count holes that don't have an exit, there are thousands of pores you could count
"The human body has 7 holes" is most likely a reference to [this vsauce video], and admittedly said video is the entirety of my knowledge on topology;
that should answer "I’m really curious how you got that number", and... probably the comment I'm replying to?
I'm not sure I understand your rhetorical curiosity, but humans usually insert food in their mouth which is then pushed through the entire through-hole while being exposed to gastric acid and whatnot; another example are tears, entering the openings in the eyelids and coming out of the nostrils.
Urine is instead chemically produced by the kidneys, and, unless you consider the space between molecules (which AFAIK is not within the domain of topology), that doesn't count as one shape traversing a through-hole of another.
Topological holes are through-holes. If there is no exit, you could continuously deform the shape until the hole is gone
So if i dig a hole in the ground that's not a hole? Should we pivot to divot?
Correct, that's not a hole in the topological sense. A famous example is a coffee cup: the handle is a (through-) hole, but the inside of the cup is not. As such, the coffee cup is isomorphic (=identical in terms of their overall structure) to a donut.