Africa, art history, global warming, and gospel music are among the varied course topics on the spring and summer calendar of Opportunities, a lifelong learning program started by the Marshfield Council on Aging in partnership with Ventress Memorial Library and the historic 1699 Winslow House and Cultural Center. Adults of all ages - not just seniors - are welcome. Most courses cost $20 and take place during the daytime. The program has a Facebook page titled “Opportunities - Marshfield Lifelong Learning,” with a link to the schedule. To register, visit the Council on Aging at 230 Webster St.