You have an IQ above 140 if you can solve this math puzzle in 9 seconds. Go ahead and test your intelligence now!

You have an IQ above 130 if you can solve this math puzzle in 10 seconds. Go ahead and test your problem-solving skills now!

Find out how smart you are (and increase your IQ ... questions are designed to be very difficult. If you cannot figure out the answer, simply select I don't know and move on. After finishing this ...

The world's shortest IQ test not only reveals your intelligence but also your level of patience. The test, called a Cognitive ...

Performance on cognitive tests does improve with practice ... the same intelligence test several times may improve their ...

The world's shortest IQ test will grill people with just three math questions, and only 17 per cent have managed to answer all correctly. Called the Cognitive Reflection Test, the set of questions ...

How clever are you and how does your brain power compare to the rest of the UK’s? Is your smartphone making you stupid? Can you make yourself more intelligent? When it comes to measuring ...

You want to know how smart you are? The Great British Intelligence Test has measured the brainpower of the nation in one of the largest intelligence experiments of its kind ever undertaken.

And you could help by taking the Great British Intelligence Test. We'll be presenting the overall results of our test in a special episode of Horizon, which will be broadcast on BBC2 in the coming ...