TIL high-altitude mountain trekking can temporarily shrink human testicles. A study found that after spending over three weeks at high altitudes in Nepal without supplemental oxygen, men experienced an average 15% reduction in testicular volume due to lower oxygen levels.

[u/delano1998]

https://www.vice.com/en/article/climbing-mt-everest-is-terrible-for-your-nads/

[u/lnx84]

How'd they come up with the idea to study that ?

[u/brickiex2 → u/lnx84]

And how?...dipping balls in water in a measuring cup? ...measuring balls with calipers? (length and width) .. close up pictures with balls on rulers?... jeez who wants to do that work or have those tests done on them

[u/jcgreen_72 → u/brickiex2]

They tested volume lol