When I sat down with my granddaughter and her homework the other day, the one concept I remembered from school was about the electron. I remember protons and neutrons and electrons.
I quizzed her a bit on their definitions. The electron is the negatively charged particle. I think that's about as far as my non-science brain was able to understand back in school. Science was never quite my subject, though I always wanted to be able to understand it. I was gifted with a different kind of intelligence, but I always wished I had it all.