Science By KohrsAlex Sep 21, 1590 Zacharias Janssen Crafted lenses, made single lense microscopes. Oct 24, 1632 Anton van Leeuwenhoek Jul 28, 1635 Robert Hooke Apr 5, 1804 Mattias Schlaieden Dec 7, 1810 Theodore schwann Oct 13, 1821 Rudolf Virchow
