Google is praising the labor of love of microbiologist and doctor Dr Stamen Grigorov with a Doodle on what might have been his 142nd birthday.

Brought into the world on 27 October 1878 in the town of Studen Izvor in western Bulgaria, Stamen Grigorov is most popular for finding Lactobacillus bulgaricus, the bacterium crucial for the aging of milk into yogurt.

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