Social Security Administration. The Social Security Administration assigns social security numbers; administers the retirement, survivors, and disability insurance programs known as Social Security; and administers the Supplemental Security Income program for the aged, blind, and disabled. SSA.
Prosopagnosia is a neurological disorder characterized by the inability to recognize faces. Prosopagnosia is also known as face blindness or facial agnosia.
Offhand, you might guess ten, or twenty, from fear to disgust to sadness to joy to skepticism. But researchers now say that human faces might only be able to make four universally recognized facial expressions. For a while, researchers thought that there were six faces that everybody in the world could identify: happiness, sadness, fear, anger, surprise and disgust.