... Over the next couple of days, ask a random selection of the people you meet to tell you the difference between 1/4 and 1/5. ... Show your subjects the equation e = mc2 and ask what it means. ... The equation is the most famous in science. ... Most associate it with Albert Einstein and many will say it has to do with mass and energy. A heartening number of students and teachers will even tell you the equation states that energy is equal to mass times the speed of light squared. ...