The usual parroting of "60,000 miles of Blood Vessels" and "100,000km of Blood Vessels" is incorrect. Medical "knowledge" or "fun facts" is flawed like any other.
These guys went through the trouble to verify the source and found it was only a fun calculation by an expert at the time in 1929. Yes, a fun calculation just like the BMI number.
You have to appreciate people who dig down to find out how people don't cite sources for what they quote = plagiarism + bad information. You'd think if someone quotes even marginally a calculation that they would cite the source of the calculation. This is how these games of telephone come about.
Again, have to appreciate those who question things like this and go down that rabbit hole because most people will not.
Number of sources around the internet who have referenced "60,000mi of Blood Vessels" just to show how bad information is viral when you don't question it.
1. National Geographic: https://www.facebook.com/natgeo/posts/friday-fact-the-human-body-contains-60000-miles-97000-km-of-blood-vessels/179026865472040/
2. Quora: https://www.quora.com/Are-our-blood-vessels-really-100-000-km-long
4. Complete Anatomy: https://3d4medical.com/blog/blood-vessels-the-60000-mile-network-inside-us-anatomy-snippets
5. Vasucular Specialist: https://www.vascspecialists.org/blog/60000-miles-inside-your-body
Fun facts are not FACTS when they are unverified and unquestioned.