Youth Entrepreneurs Georgia is hosting a workshop Saturday to teach metro Atlanta students how to design apps for mobile devices. The “World Series of Innovation” seminar will be held from 10:05 to 2 p.m. at the Georgia-Pacific auditorium and conference center training facility. For preregistered students only. Information: www.gp.com/yeatl/.

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Inventor Lonnie Johnson stands with his Super Soaker water guns at JTEC Energy on Wednesday, Oct. 29, 2025, in Atlanta. Johnson, a former NASA engineer, is currently working on a new energy technology through his company’s JTEC device that turns thermal heat into usable energy. (Natrice Miller/AJC)