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In 1882, Robert Koch discovered Mycobacterium tuberculosis, the pathogen that causes tuberculosis. Here is another substantial technology contribution from Carl Zeiss to the battle against infectious ...

But Why is a show led by kids. They ask the questions and we find the answers. It’s a big interesting world out there. On But Why, we tackle topics large and small, about nature, words, even the end ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Courtney Schley Courtney Schley is deputy director of editorial operations and ...