Personalized Nuclear Eggineer Youth Long Sleeve T-Shirt. Eggineers are engineering eggheads. Nuclear Eggineer text with an egghead surrounded by a green glow and holding a Geiger counter is a fun gift design for holidays, birthdays and graduation. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)