German scientist Julius Richard Petri's 161st birth anniversary has inspired to Google to dedicate an interactive doodle showcasing his invention, the petri dish, in full action. The interactive doodle features coloured petri dishes replacing the Google logo complete with the play button. After pressing the play button, a hand appears with a swab applying a solution on each of the dishes followed by the appearance of bacteria on each one of them. When you hover the mouse pointer on the dishes, they show the origin of the bacteria. The dishes show bacteria present in worn socks, door knob, keyboard, pet dog, plant, and a wet sponge complete with animated images. Julius Richard Petri was born on May 31, 1853 in Barmen (German Confederation). He studied medicine at the Kaiser-Wilhelm-Academy for Military Physicians and got his medical degree in 1876. Petri further pursued his studies at the Charite Hospital in Berlin and served as a military physician till 1882, becoming a res