This free event at the Arnold Arboretum offers a great way to explore plants. Take the guided tour, participate in fun science and craft activities for kids, look through a microscope, and chat with knowledgeable staff and volunteers. They will highlight different special collections each spring and fall. Free; no registration needed. Hickories, oaks, and walnutsâ€”oh nuts! Look on the ground and look up above; in fall the Arboretum is a great place to see a diverse variety of both familiar and odd nuts. Come learn what a nut really is, go on a nut hunt, look closely at a variety of nuts and non-nuts, or take a guided tour to understand the conservation, ethnobotanical, and horticultural value of nut trees. Meet near the Centre Street Gate on Sunday, September 29 at 1 pm.