I was SO lucky to have an amazing teacher in high school that taught me how to do this. I honestly am depressed at the quality of writing my college students turn in to me. I think I may teach them this as well.
Calculus for Beginners and Artists is an online textbook that provides an overview of Calculus in clear, easy to understand language designed for the non-mathematician. Thank you MIT OpenCourseWare for awesome, free resources and classes!!!