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I saw a post about how many people you need to kill to make a sword out of the blood of your enemies, it said four hundred people, but that's bull
short math
The typical range for blood ferritin is: For men, 24 to 336 micrograms per liter. For women, 11 to 307 micrograms per liter.
An average adult human has around 5 litres of blood
a sword needs, let's say, 2,5 kg of iron
5 x 200 x 10^-6= 0.001 g
2500 : 0.001= 2500000
you need to kill 2.5 million people if you want a sword made of blood
(what am I doing with my life)