Some of the greatest scientific discoveries haven't resulted in Nobel Prizes.
Louis Pasteur, who lived from 1822 to 1895, is arguably the world's best-known microbiologist. He is widely credited for the germ theory of disease and for inventing the process of pasteurization — which is named after him — to preserve foods. Remarkably, he also developed the rabies and anthrax vaccines and made major contributions to combating cholera.
