A bearing mechanism for a transverse leaf spring that can be mounted near an axle of a vehicle. The first screen portion and the second screen portion are held together by a screen hinge mechanism. The memory controller chip has a SerDes interface for communicating with a SerDes interface of an integrated circuit chip of the memory system. The car seat can have a foldable cup holder that clips onto the side of the seat body. Light components that are reflected by the radiation entry surface, etc.