An interactive robotic apparatus that interacts with a user, especially an elderly individual to provide companionship and comfort. For example, the transmitter andor receiver latency paths of the transceiver can share an interleaverdeinterleaver memory. A ferromagnetic layer is formed on the suspension member, and the suspended contact is attracted or repelled toward or away from the fixed contact. The sample well tray holder is configured to rotate about a first rotational axis. One embodiment provides a robotic mule\u2014a payload-carrying vehicle.