Brain teaser puzzles test the reader's critical thinking and problem-solving skills by challenging them to solve a problem.

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These quizzes seek to test your IQ by asking you various challenging questions about all kinds of subjects. Take each quiz to find out if you're a genius (I bet you are). Time to test your vocabulary ...

A simple visual test is surprisingly accurate at predicting IQ, according to new research. The study, published today (May 23) in the journal Current Biology, found that people's ability to ...

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