Keep The Level, Color And Temperature The Same In A Leaky Cup Of Yellow Yellow Water - Maintain Homeostasis To Keep 'homer' Alive. Keep the level, color and temperature the same in a leaky cup of yellow water - maintain homeostasis to keep 'Homer' alive! Homeostasis is traditionally a tricky concept to teach. This is a memorable and successful way to finally get this central need of life across to students with a fun challenge. It's tried and tweaked, easy to resource and links the lab to the way their bodies work. It can work as the starting activity to any level of physiology course, within the characteristics of life unit at the start of middle school life science, or toward the end of a unit on cells.