The IQ test has a dark history

"Since its invention, the IQ test has generated strong arguments in support of and against its use. Both sides are focused on the communities that have been negatively impacted in the past by the use of intelligence tests for eugenic purposes.
The use of IQ tests in a range of settings, and the continued disagreement over their validity and even morality, highlights not only the immense value society places on intelligence — but also our desire to understand and measure it."

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Via: The Week