Three short (4-5 session) curriculum units and an engineering design challenge include firsthand, guided explorations of energy in everyday phenomena. Beginning with easily observable phenomena, such as ball collisions, students look for signs of energy, create and use a variety of representations including "energy cubes," and discuss questions and findings. They develop the practice of asking, "Where does the energy come from?" and "Where does the energy go?" and learn to track the flow of energy in increasingly complex scenarios.