Hamm and Leeuwenhoek were the first scientists to observe human sperm cells (spermatozoa) using an improved microscope in 1677 (more than 1000 years after Muhammad ).

• 公元1677年,两位科学家翰姆(Hamm)和列恩福克(Leeuwenhoek)首先使用改进后的显微镜观察人类的精子细胞(在穆罕默德年代的1000多年之后)。