As students and travelers, we've all been there -- dreading the moment when class would end and we'd have to go back to our host family's house where nothing (absolutely nothing) was comforting or even familiar, spending hours on long-distance phone calls with our moms/dads/friends/boyfriends/girlfriends back home, crying because the internet disconnected us from our "normal" lives for even an hour, or even feeling that everything in our host country is amazing and that we never want to retu...