Google doodle honours Nobel-winning physician Robert Koch
Today's Google doodle honours German physician Robert Koch, known for pioneering modern bacteriology. Koch identified bacteria behind cholera and anthrax and received the 1905 Nobel Prize in Physiology or Medicine for discovering tuberculosis-causing bacterium. The doodle illustrates potato slices, the medium he used to isolate the bacterium and Petri dish, invented by his colleague, Julius Petri.