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 will be held Tuesdays, March 6, 13, 20, and 27, at 1 p.m., and Wednesdays, March 14 and 28, at 4 p.m. Rainbow Stew is located on the south side of the highway in Old Town Yucca Valley.