TIL that the number of 100,000 km for the length of human blood vessels used some VERY generous assumptions, and that it is actually around 9,000 to 19,000 km.

https://pmc.ncbi.nlm.nih.gov/articles/PMC7867635/
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1go4hc0/til_that_the_number_of_100000_km_for_the_length/