The "Science Behind" series continues this month at Walking Mountains Science Center in Avon with "The Science Behind Homemade Herbal Balms and Lotions." The hands-on, educational class is set for Wednesday at 6:30 p.m. Discover how to make healing lotions the way your grandparents did. Using natural materials such as beeswax, shea butter and various essential oils, learn the art of creating your own skincare products. Participants will make hand cream, sunscreen, healing salve and lip balm, all without the use of petroleum products. This program is hands on and interactive; participants will leave with multiple samples of each item. These would make for great holiday gifts.Rita Manna, owner of Reet's Garden & Design LLC, will teach the class in conjunction with Lara Carlson, from Walking Mountains. Manna is a certified and licensed permaculture designer and landscape designer who specializes in herbal and medicinal plants. She will discuss some of the healing properties of the ingredients used in each product. The Science Behind series of classes highlights useful and fun skills that have underlying scientific principles. Each class provides a hands-on, interactive component, with instruction from a local subject-matter expert and a Walking Mountains educator. Classes are held once a month at Walking Mountains Science Center in Avon. Space is limited, and the cost is $20 per person. Call 970-827-9725.