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How about something totally different, like putting graphics hardware to good use?
If you really want to have graphics, then HLSL (High Level Shader Language) is the way to go, but if you want to use the GPU for real number crunching, you might need something that's a little more general and less geared towards graphics.
What kind of number crunching? How about AI? Neural networks needs a few (matrix) calculations and GPUs are very good at that.
"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."
If software development were a circus, we would all be the clowns.
It is interesting how your 'passion' can affect the language of choice.
Currently, I am working with OSISoft technologies and, because of that, don't actually do a lot of 'programming' per se; I do a lot of equation configuration using functions within the applications and that can test my reasoning ability at times.
Having said that, I do most of my programming with the application in VB.NET. Why VB.NET? Familiarity.
Given time, I'd like to learn C# and start writing my code in there, but.. I write so little code it isn't time effective to really learn the language.
"There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the other way is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult." - C.A.R. Hoare
Not learn, but suddenly gain 10 years experience in: Java. Whilst in the job market, I've passed over so many really good opportunities that demand high levels of Java experience. I could learn the language properly in a week.
Otherwise: Ruby. I'm already learning Python and TypeScript, and new languages like 'GO' haven't made my TODO) list yet.
My current skill set centers around C++/C#/C, Windows desktop, and process control applications. COBOL programmers have a higher success rate at finding jobs than that.
F# is pretty awesome. It's a functional-first language with access to all the .NET APIs you know and love. It's also just a really good language. Compared to C#, it makes lots of common and useful things easy to code (collection literals, record types, discriminated unions), and has some particularly powerful and interesting advanced features (computation expressions, type providers).
There are lots of other interesting languages (Swift, Rust, and Clojure are high on my list as well), but especially if you're comfortable in the .NET/Visual Studio world, F# is really outstanding.