The CIA (Central Intelligence Agency) challenged Twitter users to spot the difference between two photographs as a test of their observational skills - with some even surpassing the target
The CIA has laid down a challenge to test if people have the sharp eye and attention to detail needed to make it as an investigator.
Only the sharpest minds make it through the selection process for the Central Intelligence Agency in the United States, which is tasked with gathering and analysing security information from around the world.
Its official Twitter account shared two photos of the same scene, challenging users to spot 10 small differences between the images - but some discovered it to be a trick question.
The tweet read: "Put your observation skills to the test. Can you spot the 10 differences in the photo below? Check back tomorrow to see if you found them all."