I'm a long-time programmer and FOSS advocate, particularly encouraging the use of FOSS in education (libraries, schools, community centers, etc). I've done a fair amount of tutoring in that regard. Of late, I've trying to learn electronics.
[ my public key: https://keybase.io/ubuntourist; my proof: https://keybase.io/ubuntourist/sigs/GwzlkFhKoROUPpRHBN-eXUaR4NtrpAjOB2Hut2zgDrQ ]