When reading about interviews I always remember about a study mentioned in "What Colour is Your Parachute?" They said that HR professionals selecting candidate

When reading about interviews I always remember about a study mentioned in "What Colour is Your Parachute?" They said that HR professionals selecting candidates had a slightly LESS success rate than completely random choices when looking at the candidates' performances 6-12 months later. The idea to always "hire people smarter than you" has never really made sense to me. If you always hire people smarter than you, won't everyone eventually realise they're working for an idiot and leave? The people I've enjoyed working the most for have been people around the same intelligence as me, IMO.