AP BIOLOGY

Detailed explanation-1: -The great confrontation between the two men occurred when in 1686 Newton published the first volume of his Principia and Hooke affirmed that it was he who had given him the notion that led him to the law of universal gravitation. Hooke demanded credit as the author of the idea and Newton denied it.

Detailed explanation-2: -In 1589, Galileo conducted experiments with gravity, such as dropping balls from the Leaning Tower of Pisa; he discovered that they hit the ground at the same time despite having different weights. Newton’s work, 100 years later, put together a picture of gravity good enough to last another two centuries.

Detailed explanation-3: -Legend has it that Isaac Newton formulated gravitational theory in 1665 or 1666 after watching an apple fall and asking why the apple fell straight down, rather than sideways or even upward.

Detailed explanation-4: -Albert Einstein once said that Isaac Newton was the smartest person who ever lived. However, this does not mean he was a perfect person with no mistakes. Even though his three laws of motion and gravity were right, he tended to put God in scientific blanks that he had no explanation for.