Well, I did learn quite a lot of medical things. I know disturbingly many things about microbes, human body and cancer. As for engineering - much less, but I learned how to brew beer (and now it's my hobby. Best. Hobby. Ever.).
I speak Polish (my native language) and English. I'm currently studying Danish as I am attending university there. I've also studied Japanese for a year, but I don't remember much. Maybe except わたしわヅラキアで. But I hope to resume learning it sometime...