Nahant rocks: Inspired by curious grandchildren, four environmentalists study local geology

From left, Amy Klee, Barry Sidwell, Ellen Antrim, and Vi Patek the Nahant rock formations that are featured in the new S.W.I.M., Inc., book they helped create, "A Guide to Exploring the Rocks of Nahant and How to Become a Rock Detective." (Spenser Hasak)