Figure 1.5 shows a miniature “The Thinker" fabricated by a technique called two-photon polymerization.29 Figure 1.6 shows a "molecular person", consisting of 14 carbon monoxide molecules arranged on a metal surface fabricated and imaged by scanning tunneling microscopy.30 These two fig- ures show what the current technology or nanotechnology is capable of, and new capability is being developed and the existing techniques are being further improved pushing the current limit to further smaller size.