Molecules of a like kind have an affinity:-"Liu explains that all life molecules are paired as left-handed and right-handed structures. In scientific terms, the phenomenon is called chirality. Nature's selection of only right-handed sugars and left-handed amino acids upon which to build life might be much simpler than we expected before.-"Liu found that any molecules, if large enough (several nanometers) and with an electrical charge, will seek their own type with which to form large assemblies. This "self-recognition" of left-handed and right-handed molecule pairs is featured in the March 10, 2015 issue of Nature Communications."-http://www.sciencedaily.com/releases/2015/03/150311185836.htm-Still no explanation how the first molecules originated.