article_snippet.sent: In 1677, at the age of 41, Dutch natural scientist Antoni van Leeuwenhoek embarked on an extraordinarily gruesome experiment, using Dutch natural scientist Antoni van Leeuwenhoek as a guinea pig.
article_snippet.sent: 41 van Leeuwenhoek (pictured in a portrait ) used Dutch natural scientist Antoni van Leeuwenhoek as a guinea pig in an experiment .
highlights_snippet.sent: At 41 van Leeuwenhoek used his body as a guinea pig in an experiment .
  