In one aspect of the invention, a drill string comprises a drill bit with a body intermediate a shank and a working face, and the working face comprises at least one cutting element. Preferred prostheses exhibit reduced production of particles from the prosthesis during wear of the prosthesis, and are substantially oxidation resistant. The present invention also includes an automatic adjustment step in which the ambient light intensity is measured and the display intensity is automatically adjusted according to a correlation defined in the calibration step. Forming the recessed portion of the metal connect in contact with the first active region and the second active region mitigates RC coupling, such that a first gate is formed closer to a second gate, thus reducing a size of a chip on which the recessed portion is located.