 And please make sure to tell us how to reach you. You can send us a voice memo at hibtid.wondery.com or you can call and leave a message at 1-800-433-1298. And don't forget to sign up for my newsletter at GuyRoz.com. It's free and full of great insights from some of the world's greatest entrepreneurs. This hour of Planet Money and How I Built This was produced by Kerry Thompson. I'm Guy Roz, and you've been listening to How I Built This.