Prescott Moncrieff received a "Fact Checker" badge on Sep 18 because they verified or disputed a fact and backed up their claim with some kind of written or visual proof. If we didn't have someone to check the facts, none of the facts would get checked - and then where would we be?!
Prescott Moncrieff received a Spell Chek badge on Apr 18 for they're proofreading acumen. Not that we need a proofreader around hear, for the most part - but it never hurts to check over you're work before you put it on the Internet!