More than just riding herd on molecules, such subtle forces make it possible for structures to assemble themselves into an ever more complex hierarchy. (science.sciencemag.org)
Our world consists of complex hierarchies of about 100 different chemical elements, and it is the arrangement of these elements into molecules that gives rise to the rich set of materials around us — from the sugar molecules... (newscientist.com)
Like those in Minneapolis, most teachers work for complex hierarchies that could become more participatory and streamlined while retaining their basic shape. (educationnext.org)