I delivered this TEDx talk, my first, on May 31, 2014 in Hong Kong to an audience of 1,000+. The short answer to the question? Homeschooling. These slides may not make much sense by themselves. You'll want to review them along with my talk at https://www.youtube.com/watch?v=mummj4SwpU0.
24. Joshua J. Steimle
@donloper
“…Among the homeschooled
students admitted in recent
years was a student who
graduated as valedictorian of
the Class of 2002.”