After testing more than 13,000 people, researchers in the US found just 31 who could always tell when people were lying or telling the truth.

Those "wizards", as the scientists called them, picked up on tiny changes in facial expressions which most of us miss to see if someone was fibbing.

They hope by studying the wizards, they can train police to spot liars too.

The scientists reckon the wizards pick up on the mismatch between what someone says and what they seem to be actually feeling.

That's because some of the muscles in our face aren't under our control.