3 Building on the basics of biology
One approach to nanotechnology - often called bionanotechnology - involves stripping down and then partially reassembling a complex and only partially understood biological system to get an artificial nanostructure that works. This structure was made by Nadrian Seeman of New York University by self-assembling DNA molecules with specially designed sequences. From N C Seeman 2003 Biochemistry 42 7259-7269