We have have a personal anecdote on one side, and modern psychometrics on the other:http://infoproc.blogspot.ca/2010/05/psychometric-thresholds-for-physics-and.

We have have a personal anecdote on one side, and modern psychometrics on the other:http://infoproc.blogspot.ca/2010/05/psychometric-thresholds-for-physics-and.html http://infoproc.blogspot.ca/2010/05/psychometric-thresholds-... I'll go with psychometrics on this one.