English physicist and Nobel laureate famous for discovering argon, a nobel gas along with William Ramsay. He is also known for the phenomenon of Rayleigh scattering by which one can explain why the sky is blue and for predicting Rayleigh waves (surface waves).
The El Capitan OS X version is named after the El Capitan rock formation at the Yosemite National Park. Wallpapers that came with the operating system featured this vertical rock. [more...]