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.
Percentage of time devoted to the accessed topics. From top to bottom, the specialities displayed are: Electronic Engineering; Economics; Chemistry; Mathematics; Computer Science; Police corps; Physics; (exploration). The percentage of time is displayed after the bars and the exact time within the parentheses.
