Is there a way to choose the content u translate/learn (like technology, science etc) or to choose websites from which to translate from (wikipedia or whateva)?
I believe, at the moment, the answer is no. Actually, i think it is quite fun reading and translating something that i would normally have no interests in. And i do think a broad spectrum of topics is beneficial to learning a language. Also, my understanding is that duolingo provides these free language courses to us, and in return we help them to translate something. So, i guess the translation given are part course material part course fee !! :P