Background: I've got a friend who is interested in physics. He is 20 years old, has no high school or college experience (has a GED though), and is considering pursuing a degree in physics. Currently he's working blue collar jobs, but would like to go to college someday. His math background is very weak, as is pretty much everything else. I understand that if he is seriously pursuing a college education, getting him up to speed in math is the first step. However, in the meantime, he is just wanting to learn as much about physics as he can. Are there any good resources that he might benefit from? He's really aiming for an informal, not too structured study of physics. Any help would be appreciated, thanks!