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IQ tests have been used to measure children’s mental abilities, played a role in capital punishment cases and affected government mental health benefits and company hiring decisions. And while there's a general awareness of their shortcomings of intelligence testing, author Stephen Murdock says the tests remain as ubiquitous and important as ever. We look at the long and often controversial history of the IQ test.

Guest

• Stephen Murdock, author and journalist who has written for many publications, including Newsweek, The Washington Post and the Boston Globe