The grand opening of the Oneonta World of Learning takes place Saturday at Fortin Park on Youngs Road in Oneonta from 11:00 a.m. until 4:00 p.m. Organizers say Bob the Builder activities are planned for the kids along with a beginners weed walk with an herbalist, science demonstrations, and a Nano exhibition. Admission is free and for more information call (607) 431-8543 or visit oneontaworldoflearning.com