Santiago Ramón y Cajal in his laboratory

Santiago Ramón y Cajal in his laboratory
The 1906 Nobel Prize in Physiology or Medicine was awarded to histologists Camillo Golgi and Santiago Ramon y Cajal. They had dueling interpretations of the neural structure of the brain based in differing interpretations of the same images. Cajal won the prize for his correct theory and Golgi for the staining technique he invented to make it possible.

Know more: http://www.nobelprize.org/nobel_prizes/medicine/laureates/1906/cajal-bio.html