Google Doodle has marked the 384th birthday of scientist Antoni van Leeuwenhoek - considered the world's first microbiologist who discovered sperm. Van Leeuwenhoek, was born today in 1632 ...

Leeuwenhoek: The fabric seller who discovered bacteria How a humble Dutch merchant, Antonie van Leeuwenhoek, became the first person to peer into a world of tiny creatures invisible to the naked eye.