Design of geometric molecular bonds.

An example of a specific molecular bond is the affinity of the DNA base A for T, but not for C, G, or another A. This contrasts nonspecific bonds, such as the affinity of any positive charge for any negative charge (like-unlike), or of nonpolar material for itself when in aqueous solution (like-like). Recent experimental breakthroughs in DNA nanotechnology demonstrate that a particular nonspecific...