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 Solitaire illusion. Each array contains an equal number of black and white dots, but human adults typically overestimate the centrally-located black dots in the image at right relative to the peripherally-located black dots in the image at left.
