Send your kids out of the room -- we're about to talk about Santa Claus.

You know, Santa Claus -- that jolly old Christmas character and one of the biggest lies parents feed to their kids. Well, at least it's a lie you only have to keep up for a few years before they figure it out. But at what age does that happen? Do you remember how old you were when you learned the truth about Santa? How did you figure it out? How about your kids? There's actually a recent study which shows that kids have it all figured out by age eight. In fact, some developmental experts believe some kids catch on as early as pre-school.