Figure 1.
Norm of the acceleration experienced by a mobile phone when its owner is walking (a), and not walking, but gesticulating with the mobile in his/her hand (b).
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.