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.
Periodical. Lederberg, Joshua. "Power's Good Safety Score Can Be Further Improved." Washington Post, (31 January 1970). Article. Newspaper Column. 1 Image.. Washington Post. Lederberg UI. S192