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.
A sample network of friends (exhibiting median number of connections). Nodes A–H represent the participant's eight best friends; the participant (with connections to all other nodes) is not shown. In this example, friend A is the most well-connected (with the maximum seven connections to the participant's other friends); friend E is the least well-connected.
