Monday, June 23, 12:30 p.m. – Pry into the physics, chemistry and utility of buoyant force with an aerospace engineer and STEM instructor! Explore the function, history and pitfalls of everything from ocean vessels to lighter-than-air vehicles. For rising middle school and high school youth. Free. All are welcome. Registration required by calling 404-303-6130. Email: for more details. Sandy Springs Branch Library, 395 Mount Vernon Highway, NE, Sandy Springs, 30328.