There are other fairly common examples without that sort of filtering of applicants. High school academics and athletics are good places to look. Genetics don'

There are other fairly common examples without that sort of filtering of applicants. High school academics and athletics are good places to look. Genetics don't explain how a good coach can turn around a school's athletic program to the point of taking a team to the state championship or how a good teacher can take a population of students with a history of failure and dropping out and turn them into students who score 5's on AP calculus exams.