I just read Duolingo's Wikipedia page. Nicely written- good info!
Regarding the language learning services of Duolingo, can students donate to the cause and, if so, is there a way to do this online?
I'm not aware of them receiving any grants. They have had ~$18 million invested in them by venture capitalists on the expectation that the translation service will make money.
Thanks OskaLingo. I was somewhat disenheartened when I saw that NEA had provided the angelisme thinking that NEA meant the US labor union-like entity called the National Education Association, a group which has absolutely destroyed public education in America. But upon researching it I found that this good NEA is New Enterprise Associates, an actual venture capital group. Good for them.