Tell Me How Career Series - Career Education & Opportunities for Young People. Recommended for both School, Public Libraries and Guidance Offices. The Tell Me How series is a necessary addition to any library, guidance center of school curriculum. It explores a large number of career opportunities for young people and features real people doing real jobs. In this program host Melody Young visits mineralogist Joel Bartsch to discover the real value of minerals and gems. Subjects Covered Include: What does a mineralogist do? Are all minerals valuable? What is the difference between a mineral and a rock? What is the most precious mineral? Why do they use minerals in toothpaste? Why are some minerals so colorful? What is fools gold? What is a gemstone? What makes a mineral valuable? What is a carat?