how did isaac newton created calculus
Newton actually discovered calculus between 1665 and 1667 after his university closed due to an outbreak of the Plague. Newton was only 22 at the time, and he preferred not to publish his discoveries. Meanwhile, in Germany, Leibniz discovered Calculus independently and he was very open with his findings. This led to a bitter dispute between the two mathematicians later known as the Great Sulk. Today it is well known that both men discovered calculus independantly of the other, Leibniz about 8 years after Newton.