An idea of calculus was already found in ancient Greece. Archimedes used it to calculate the area of parabola by assigning a 'weight' to a line, and using a lev

An idea of calculus was already found in ancient Greece. Archimedes used it to calculate the area of parabola by assigning a 'weight' to a line, and using a leverage to balance it. There is a good Numberphile YT about it called 'Parabolas and Archimedes'