In this paper, we aim at introducing one of the well-known OR-methods, called simulation, to children. Instead of using classical programming language, we choose the hand-on simulation to teach 20 children, between 8 and 12 years old, to simulate a robotic warehouse, similar to Amazon Kiva System. In such system, robots are sent to carry storage units from the inventory and bring them to human operators, who work at picking stations. At the stations, the items are packed according to the customers' orders. Such hand-on simulation utilizes storage and retrieval robots made from Lego Mindstorms©. The children are divided into groups to simulate different parts of the robotic warehouse, such as picking station, storage area, in a given control system (called “RawSim-O”). Because of utilizing such hand-on simulation, the children should understand the process of e-commerce and operations within a robotic warehouse.