John Burdon Sanderson Haldane had no formal education in any scientific subject and yet he became a commanding figure in biochemistry, evolutionary theory, genetics, and physiology, publishing over 400 papers and 24 books.
Ronald Fisher was an evolutionary biologist and statistician. He is perhaps best known for inventing an array of revolutionary statistical procedures that could be used within the natural sciences, but his contribution to our understanding of evolution goes far beyond the statistical tests with which he most widely and commonly associated.
Although this is intended as a light-hearted guide to areas of science that might interest you, it serves to illustrate the inter-disciplinary nature of science.