While many of us like to think of ourselves as pretty smart, it can often be a difficult point to prove.
One way to challenge your brain is by taking on an intelligence quotient test - better known as an IQ test. However, many versions of these tests can take hours to complete, with as many as 50 questions to asses your cognitive abilities.
But if you are keen to put your brain to the test in a speedier way, there is a must quicker test you can take. The Cognitive Reflection Test (CRT) is said to be the world's shortest IQ test, with those taking part only required to answer three questions.
