Ask HN: What are you currently learning in your spare time?

HNers, what are you currently learning in your spare time? Some new js framework? Machine learning? New devops technics?

:)

I've been digging into Haskell in the time I have to program at home. Im going through the course at http://www.seas.upenn.edu/~cis194/spring13/lectures.html.

In addition to the classes, I've been trying to use it to write small programs and whatnot.

While I can't use Haskell at work, I can say working with it more regularly has definitely improved the JavaScript code I write on the job.

Clojure

I'm learning German. I've never learnt a non-machine language before and having just moved to Berlin I thought I'd try not being that jerk foreigner that only speaks english, even after living here for 2 years. So far it's been quite fun. Last week I finally cracked the level where I understood a conversation of a Couple passing me on the street.

Although I already have my finance degree and wouldn't so much need it, getting my CFA is a near-term goal.

Learning wise, trying to completely re-learn mathematics, starting with books like the Mathematicians Delight and beginning with the most basic arithmetic, hopefully up through diffy q's, linear algebra, and intermediate stat. If anybody has any good tips on completely teaching yourself math from start to finish, please send them my way!