Resumen de Speaking in ripples
It wasn't always distasteful to suggest that reality is, well, real. Before quantum physics, people's understanding was governed by classical theories in which reality exists regardless of observers. The thin end of the wedge came in 1905, when Albert Einstein said that the photoelectric effect in which certain metals give out electrons when illuminated, can only be explained if light is made up of quantum particles--photons as they came to be called. The thing was, light was known to be a wave. In the early 1800s, Thomas Young had done a version of the now classic double-slit experiment, in which light is shone at two parallel slits. The interference pattern formed on a screen beyond is what one would expect if waves of light were spreading outwards from both slits--behavior that seems impossible if it is made of single particles. Here, Ananthaswamy discusses the mysteries of quantum reality
