A videoconferencing apparatus and method are implemented. The first rod includes a hollow elliptical or oval shaped center and the second rod includes an elliptical or oval shaped exterior When the second rod is disposed in the first rod and is rotated, a portion of the exterior of the second rod binds against a portion of the interior of the first rod to secure the first and second rods together. Each of the data instance objects has a data instance header and data field. , a hub that may be separated from the remainder of the wheel assembly. The power supply enables discrete implementation of a low-cost, spread spectrum controlled, sigma delta modulated power supply for spectrally pure, high efficiency, low EMI power amplification. The combination apparatus includes a structure requiring stress andor fracture detection, and at least one elasto-mechanoluminescent material at least partially dispersed in andor on the structure andor in a coating on the structure.