Having some experience with working on things I thought were "important" and failing due to lack of passion, my advice is that you should work on interesting pr

Having some experience with working on things I thought were "important" and failing due to lack of passion, my advice is that you should work on interesting problems to you and find the path within those area to do good. It's possible to do good and evil, to be greedy or altruistic, to work on harmful or helpful things, in any domain. Life has a way of presenting the right doors to you to walk through if you are prepared to see them, but the way to start is to follow your natural interests and keep your eyes open. Luck favors the prepared mind. Along the way the main error to avoid is letting others define your thoughts and opinions -- if you remain your own person then you will find your own way to make a dent that nobody else could.