Isaac Newton and Gottfried Leibniz both invented the application of mathematics known as calculus. When I say they both did, I don’t mean to imply they worked on it together. They both independently invented calculus. Newton began working on calculus in 1666 but didn’t publish anything about it until 1693. Leibniz began working on it in 1674 but didn’t publish anything about it until 1684. Most people today believe that the two men developed their ideas separately. Charles Darwin had been working on his theory of evolution for years. He developed the theory in the 1830s but knew it would be controversial so he didn’t tell anyone about it and continued to gather evidence to support his theory. In 1858 Alfred Russell Wallace, an acquaintance of Darwin, sent Darwin a letter outlining a theory of evolution that Russell had come up with. Darwin was shocked. Reportedly some passages were almost word for word the same as Darwin’s. The two men had come up with the same idea. The reas...