Not done Sir, but doing.

Plenty is doing.

"The Flynn effect shows that environmental factors can produce differences of at least [15 IQ points, over 50 years], but that effect is mysterious in its own right."

Extract from Intelligence: Knowns and Unknowns-Report of a Task Force established by the Board of the Scientific Affairs of the American Psychological Association, Chairman U. Neisser, 1995. Washington, DC : APA Science Directorate.

Disclaimer: this quote appears here only to spark discussion. It is not endorsed one way or the other. Make up your own mind. Or just refresh the page for another viewpoint. From a collection assembled by the late Chris Brand.