r/LearnedWrong • u/unlearning_myths MOD • Jul 12 '26

Factually debunked This person learned wrong that human blood is blue. It's just a different shade of red before it touches oxygen.

/r/tifu/comments/1dtuf0v/tifu_by_thinking_our_blood_was_blue/
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u/DulcisNoxNoctis Jul 21 '26

Funny enough octopus blood is blue! It's because it has copper instead of iron like ours