The spanish "b/v"
I have only been using Duolingo up until recently to learn Spanish. It wasn't until a friend who learned Spanish in school brought it to my attention that I realized all b's and v's in Spanish are a slightly different "b" from English. Without knowing that, I've just been pronouncing them as b's and v's as they seem to be pronounced in the exercises. Not sure how this could be resolved, but it would be good to have a little pronunciation guide I guess.