Theories pass. The frog remains.

[citation needed]
Rostand was active in several causes in particular against nuclear proliferation and the death penalty. His scientific work covered a variety of biological fields such as amphibian embryology parthenogenesis and teratogeny while his literary output extended into popular science history of science and philosophy. Jean Rostand (October 30 1894 Paris – September 4 1977 Ville-d’Avray) was a French biologist and philosopher.

Jean Rostand (October 30 1894 Paris – September 4 1977 Ville-d’Avray) was a French biologist and philosopher. His scientific work covered a variety of biological fields such as amphibian embryology parthenogenesis and teratogeny while his literary output extended into popular science history of science and philosophy.