Google doodle celebrated the 142nd anniversary of the birth of Dr. stamen grigorov on Tuesday, local time. Grigorov, a Bulgarian doctor and microbiologist, discovered the bacteria necessary for yoghurt fermentation. The discovery led to the development of the first tuberculosis vaccine. In 1904, gregorov worked as a research assistant at the Medical University of Geneva, Switzerland. To ease his homesickness, gregorov’s wife gave him presents and sometimes yogurt. At the age of 27, gregorov began to study the health properties of yoghurt, and after thousands of experiments, he understood why yoghurt ferments. When grigorov examined the microscope carefully, he found a rod-shaped microorganism, which was later named Lactobacillus bulgaricus. In 1906, gregorov published a paper which introduced the first use of penicillin fungi in the treatment of tuberculosis. His continued research saved thousands of lives. IPhone 12 whole family barrel model exposed: it’s a tribute to iPhone 4