On January 23, 1840, German physicist, optometrist, entrepreneur, and social reformer Ernst Abbe was born. Together with Otto Schott and Carl Zeiss, he laid the foundation of modern optics. As a co-owner of Carl Zeiss AG, a German manufacturer of research microscopes, astronomical telescopes, planetariums and other optical systems, Abbe developed numerous optical instruments.
On this day in 1908, the 'Phyletic Museum' was giftet to the University of Jena due to its 350th anniversary by Ernst Haeckel. The famous zoologist was best known for his approaches in evolution theory.