For me it is the fact that our blood contains iron. I earlier used to believe the word stood for some ‘organic element’ since I couldn’t accept we had metal flowing through our supposed carbon-based bodies, till I realized that is where the taste and smell of blood comes from.
“Just a bit farther” is quite the understatement!
“I mean, you may think it’s a long way down the road to the chemist’s, but that’s just peanuts to space.”