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.
COMMENTARY. For the article “The inner inner core of Earth,” by Don L. Anderson, which appeared in number 22, October 29, 2002, of Proc. Natl. Acad. Sci. USA (99, 13966–13968; First Published October 21, 2002; 10.1073/pnas.232565899), the legend to Fig. 1 should have included the following statement. “Figure courtesy of M. Ishii.”
