A Place to Grow

If you click on the Google Doodle seen today in some parts of the world, a gloved hand inoculates six Petri dishes in which bacterial cultures then grow. Hovering over those dishes then reveals the source of the microbes — a stinky sock, an oft-touched doorknob, and a dirty sponge, among others.

All this is to honor Julius Richard Petri, whose 161th birthday would have been today. Petri died in 1921 at the age of 69.

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