Billy's journey started with a spreadsheet and beach walks with Yeti, capturing happiness research he kept forgetting. It became a book for skeptics and busy people who had no idea how much control they had over their own happiness. The science backs sharing: the "protégé effect" shows we learn more effectively when we teach, and each person who learns typically shares with three to five others. Billy still feels like a fraud some days, but that's the point. You don't need to be an expert. Just share your honest experience. Someone out there needs exactly what you've learned, delivered exactly how only you can deliver it.