Double Shot #1788

Concurrency in Rails 5.0 - An exploration of some new and (so-far) undocumented things under the hood.
Fork - "A fast and friendly git client for Mac". I've been playing with this a bit (I mostly use GUI clients for looking at history) and I like the tabbed UI.
Ruby Web Dev: The Other Way and Learn Ruby on Rails 5 - A couple of new ebooks to start the new year.