This question isn't so much for me as it is for my friends. I'm the only person in my group of friends that has a dream and a vision for the future and all of my firends ask for advice on how to find their passion. I don't really have an answer for them. One day it just came to me that I wanted to be an astronomer and since then i've pursued that. So my question is: are there any books out there that I can recommend to my friends on how they might get a better idea on what they want to do about their futures?