Which country has the largest stock of brilliant people? The answer to this question depends in part on raw brainpower, but also on the size of a country.
Exclusively for Business Insider, Dr. Jonathan Wai , a Duke University Talent Identification Program research scientist and psychologist, compiled a new ranking of countries based on scores on the 2009 PISA assessment , which tests reading, math, and science competency in 15-year-olds.
Note that China is not included on this list. Not every student in China was assessed, but only a few cities. And the result was that Shanghai in particular was a large outlier. Shanghai represents a tiny fraction of China's population, is a migration hub that attracts elites, and is much wealthier than the country as a whole
Below are the countries with the most brain power, noting the average percentage getting the top score on PISA tests, and the the estimated number of brilliant people: