In this episode of the PC Mike Techcast, I reveal little known details on North Korea’s elite and top secret Unit 121 cyber army that is suspected of the massive hacking of Sony Pictures. I report why this incident has sent chills down the back of Internet security experts and how a 1,800-member team of North Korean hackers operating from a Chinese hotel just over the North Korean border are hacking their way into numerous business and government computers across the U.S. Plus we talk tech in helping a listener stop his computer from locking up, we share a great app that lets you transfer data between all mobile devices,…