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.
1900 was a leap year if you’re using microsoft excel or lotus 1-2-3 though 🤡
It’s interesting that the following centuries all calculate correctly, maybe fixed along with y2k