Take a guided tour of the state-of-the-art Weld Hill Science and Administration Building at the Arnold Arboretum with Julie Warsowe, Manager of Visitor Education, on either of two dates, Friday October 21 from 1 – 2, or Wednesday, October 26, from 4:30 – 5:30. Learn about some of the cutting edge plant research and explore the “green” building and landscape design. Limit 10 people. Free, but please register at www.arboretum.harvard.edu.