This 2018 episode covers Leeuwenhoek, who wasn't REALLY a scientist -- he had no formal training. But he made dozens of scientific discoveries. He's credited with discovering microscopic life in a variety of forms, using lenses he ground himself.
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Percy Fawcett, Manuscript 512, and a Lost City in the Amazon, Pt. 1
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SYMHC Classics: Swill Milk
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Behind the Scenes Minis: Mary, Beulah, Baby Alive
33:26