Monday, July 7, 4-5 p.m. – 3-2-1…blast off and learn all about aerospace engineering! Join others ages 4-14 for this science lesson. Free, and the community is welcome. Open to the first 30 participants. Call 770-512-4640 to register and find out more. Dunwoody Branch Library, 5339 Chamblee-Dunwoody Rd., Dunwoody, 30338.