Roger Bacon (1214 - 1292)

An English monk and Alchemist, Bacon become known as the founder of experimental science. He believed that doing experiments for your self was the way to learn about nature rather than accepting what other people tell you.
His most important work was the opus maius in which he wrote about the scientific method of learning. he did many Experiments. He showed how rainbows are made by the effect of water drops on sunlight, and how lenses could be used to help people with weak sight. More reading