 and from the Doris Duke Foundation. Hey, welcome back to How I Built This. I'm Guy Raz. This is the place where we help try to solve your business challenges. Each week, I'm joined by a legendary founder, a former guest on the show who will attempt with me to help you. And if you're building something and you need advice, give us a call and you just might be the next guest on the show. Our number is 1-800-433-1298.