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.
The group starts out at rest on the left with individuals moving slowly. After a disturbance some individuals startle which triggers the rest to move rapidly outwards. Finally, they slow down and move back together to approximately the same geometric center as before.
