The above example shows how science generally advances. New evidence is usually used to improve earlier ideas rather than entirely replace them. In this way, scientists gradually refine their ideas and increase our understanding of the world. On the other hand, sometimes science advances in big leaps. This has happened when a scientist came up with a completely new way of looking at things. For example, Albert Einstein came up with a new view of gravity. He said it was really just a dent in the fabric of space and time.
When visiting the Galapagos islands Darwin observed the many species of birds there and came up with a revolutionary new idea called evolution. In the decades since Darwin first proposed his new idea scientists have used new evidence to learn much more about evolution and natural selection including how it effects plants, animals and even human beings.
What did later scientist use to refine Darwin's idea?