The Cognitive Wheel represents our synthesis of educational research and personality assessment literature with an eye towards its use in solving product design problems.
Language Errors: Expert vs. Novice
The National Hearing Test offers free hearing test via telephone (need a land line): 1-866-223-7575
An interesting TED lecture on converting color information into sounds and how this changes the brain and perception.
A post on color blindness: Color Blind Design.