On May 31st, 2013 ther will be a worldwide Google Doodle about Julius Richard Petri. Julius Richard Petri was a german bacteriologist. He invented together with his assistent Robert Koch, a very common bacteriologist and medic, the Petri dish. The Google Doodle celebrates the 161st birthday of Julius Richard Petri. It is a very nice animated Google Doodle. There are some Petri dishes with different retrieves inside. You can still watch a video about the Google Doodle on YouTube by clicking this link.