He made VACCINES for the Nazis. If the Germans had known what trick he was trying to pull on them...

Can you imagine feeding lice on your own body? A Polish biologist, Rudolf Weigl, did it in the name of science and in this way he saved thousands of people by inventing a typhus vaccine. In his institute, he used louse-feeders - people of science and culture as well as the underground state, who were particularly exposed to the repressions of the occupiers.