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People claiming superior beliefs exaggerate knowledge, study shows

No one likes smug know-it-all friends, relatives or co-workers who believe their knowledge and beliefs are superior to others.

It's true! Know-it-all people prone to overestimate their knowledge

Confirming what many people have been suspecting all along, a new study says that smug know-it-all people are especially prone to overestimating what they actually know.