If you are wondering what essential oils are all about, Rainbow Stew in Yucca Valley will hold free informational introduction classes. You’ll be able to experience the oils and see for yourself how many uses they have. Classes are set for 1 p.m. October 3, 10, 17, and 31; and 4 p.m. October 25. Rainbow Stew is located on the south side of the highway in Old Town Yucca Valley.