Leeuwenhoek was a salesman in Holland and a amateur scientist. He could make non difficult microscope. He wasnt that into reseraching with the microscope until he came apon Robert Hooke's book, "Mirrograhia". Leeuwenhoek being a great microscope builder, he could magnify up to 200 times. He examined scrapings from his teeth and found " Many very little living animalcules, very prettily moving". He was one of the first to observe and recod microbes. He didnt stop until the end of his life.