I'm reading Programming in Scala. The free online, out of date but good enough to help you decide to go further or not first edition. I have the scala repl open alongside. Never programmed in Scala, don't know that I ever will, but it's interesting. http://www.artima.com/pins1ed/

I'm also re-reading Niven's Ringworld series, as a bridgehead to the rest of his Known Space material; I've never gone beyond Ringworld before. I'm in the third book at the moment. https://en.wikipedia.org/wiki/Known_Space