Quote: “If you can't explain it to a six year old, you don't understand it yourself.”
― Albert Einstein
I remember a story of einstein correcting someone error in a theory in a blackboard with the change of one character and the target acknowledging the error and when asked einstein said it will take 2 weeks to explain. Also remember he couldn't make coffee.
Hmm, feels like another quote that people claim Einstein said.. when he probably didn't.