The Physics Equation is an item in Mario's Time Machine for the Nintendo Entertainment System.
Description
It is a scrap of paper that holds Albert Einstein's famous formula for mass–energy equivalence, E=mc2.
In Mario's Time Machine (Nintendo Entertainment System)
The Physics Equation is stolen by Bowser when he time-travels back to 1905. The Physics Equation can be found in Bowser's Museum with some other stolen historical artifacts.
Later on, after Mario defeats the Koopas guarding the Physics Equation, he has to time-travel with it to 1905 and return it to Albert Einstein.
In the news article following Mario's return of the Physics Equation, there is a tongue-in-cheek statement saying that physics students will have another reason to pull their hair out.