To learn. I interview a lot of engineers and one of my questions is: "how do you keep up to date with technology?" I want to hear about the forums they visit

To learn. I interview a lot of engineers and one of my questions is: "how do you keep up to date with technology?" I want to hear about the forums they visit (ie, HN!), youtube channels, peers, heck even magazines, radio or TV. Unfortunately most of them don't have an answer for this. One day, maybe I'll find another HN'er...