Radio 4 in Four - How can you tell if somebody is a true expert? - ÃÛÑ¿´«Ã½ Sounds

Radio 4 in Four - How can you tell if somebody is a true expert? - ÃÛÑ¿´«Ã½ Sounds
How can you tell if somebody is a true expert?
It's easier to spot flaws in other people's knowledge than to see it in ourselves.