Firearms are banned in many countries across the world, and it is highly difficult to acquire one. That is changing. The combination of 3D printing technology and the Internet - for better or worse - is moving the power of weapons manufacturing to the public domain. Learn more about your ad-choices at https://www.iheartpodcastnetwork.com They don't want you to read our book.: https://static.macmillan.com/static/fib/stuff-you-should-read/ See omnystudio.com/listener for privacy information.