A big theme of Glenn's first day back was technology and how fast the world has been changed in a short amount of time. To illustrate this theme, Glenn asked audiences to recall where 3D printing was just two years ago. Shortly after moving into his new radio studio in Dallas, Glenn and the company purchased a 3D printer. At the time, the best they could come up with were cool Batman-shaped paperweights. But now? You can 3D print a fully functioning gun.