December 16th
1929 Johann W. Ritter, who discovered ultra-violet rays, collected oxygen and hydrogen by electrolysis, made the first dry cell battery, made a storage battery and established connection between galvanism and chemical reactivity, was born.
1929 Bruce N. Ames, who developed the Ames Test, an indicator of carcinogenicity of chemicals that measures the rate of mutation by a chemical in bacteria, was born.