The optimum IQ test age is between 5 and 8 years old. Toddler IQ testing isn't accurate, but parents can support young children's development at home. You may suspect your child is quite bright, but ...

Intelligence quotient, usually shortened to IQ, is a measure of how well someone uses information, logic, and reasoning compared to their peers. The first test for measuring IQ was developed by ...

Maybe you have a dark sense of humor, or perhaps you failed your driver’s test—both are signs of intelligence, according to science. But how smart are you, really? The Cognitive Reflection Test (CRT), ...