Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Heidelberger, who had learned French in his youth from a governess, delivered this address in December, 1946, in Paris at the 50th anniversary commemoration of the death of Louis Pasteur. It was the first international scientific symposium after World War II. His hotel in Paris, a city still recovering from the deprivation of war, had heat for only two hours a day.