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.
It helps if you can compose a coherent sentence! :)
Your inability to understand is not my problem. I suggest a reading comprehension class. I understand that some of those big words like “Probabilities” and “math” might be too much for you. It’s okay. We all have things we’re good at. You’ll find yours one day.