Learners observe two joined glass tubes containing a conductive salt solution. Electrodes are passing an electric current through the water. Oxygen gas is formed in the tube connected to the positive electrode. Hydrogen gas is produced in the tube connected to the negative electrode. As the gases are formed, they float to the top where they can be collected for demonstrations: 1) a hydrogen-filled tube will make an exploding sound when lit; 2) an oxygen-filled test tube will re-light a glowing splint; and 3) a hydrogen- and oxygen-filled rocket can be launched across the room. This is an exhibit and demonstration in OMSI's Chemistry Lab and would make a good demonstration for classroom students or other learners.