 IQ test that is highly correlated with good results in business. Who thinks Elon Musk is pretty high IQ? Yeah, the eye contact thing. He's a little autistic, he says. So, I don't know if he would have passed the eye contact interview. So, pick smart people should be around you and an IQ test. It's not perfect. There are other measures of IQ like EQ and all this. Bill Gates, they once I saw an interview years ago, they're like, how'd you become the richest man in the world? He's like, I have an IQ test. That's all he hired with. He didn't care about your references, nothing. He would ask you one question. How much water flows through the mouth of the Mississippi River? Here's some parameters. It's about eight miles wide and the velocity of the water is this. And if you answer that question, you are hired. Nobody's beat his record. He was the wealthiest man in the world for 20 years straight. Nobody's, I mean, Elon one year and then the next year. Now it's nobody's been able to build that kind of empire as Bill Gates did. So they call them cognitive tests, but you can just think of them as IQ.