Abstract: A toilet having a first-magnet secured to the terminal end of the toilet's flush-arm and a second-magnet secured to the toilet's lid such that when the lid is in its open or up position, the two magnets align preventing the flush-arm from rotating upward to cause the toilet to flush. Conversely, when the lid is down and the two magnets are separated, the flush-arm can be rotated upward causing the toilet to flush. In another example, a magnet-attracting component, such as iron, cobalt or nickel, can be substituted for one of the magnets. A kit for retrofitting an existing toilet is also disclosed.

Abstract: A system and method for controlling multiple transponders in an aircraft to prevent the aircraft from becoming invisible to air traffic control. If a first transponder is turned off when the aircraft is airborne, a second transponder will automatically switch on. In some implementations, if the second transponder is turned off, a third transponder will automatically switch on. In one implementation, the third transponder cannot be turned off while the touchdown-relay confirms the aircraft is in the air. When the aircraft has landed, whichever one of the three transponders is on may be turned off. In some implementations the multiple transponders are arranged in a circular daisy chain.