Calculus Derivatives and Limits Reference Sheet - Includes Chain Rule, Product Rule, Quotient Rule, Definition of Derivatives, and even the Mean Value Theorem. Great resources for those in Calculus 1 or even AP Calculus AB.
Einstein said if you can’t explain it to a six year old, you don’t understand it yourself. And that sums up every person who’s ever talked about any kind of dimensions, string theory, and so on. They talk with contradictions and have explanations