Ask HN: What Systems and routines do you employ to keep your skills current?

[Carl_Platt]

I recently started using tech's that have been around for a while, but that I had no need for, and though I'm fascinated by them can't stop but wonder why I am only using them today. So I'd like to know, how to HNers keep current?

[SEJeff]

Very simple, contribute to open source software related to something you either want to learn or are interested in.