Task: Text Categorization
Input (English): An equation relating viscous flow and diffusion is named for this man and Stokes. While proving Planck's radiation equation, this man created the idea of stimulated emission. Along with Leo Szilard, this man invented a refrigerator that has zero mechanical parts. This scientist and Smoluchowski developed a namesake relation which was discovered during this man's research on Brownian motion. He won the 1921 Nobel Prize in Physics for his explanation of the photoelectric effect. For 10 points, name this German physicist who developed two theories of relativity and famously stated e=mc2.
Output (English): Science