Hand by the ability to be brought opposite to the fingers, a muscle action known as opposition. The skeleton of the human hand consists of 27 bones: the eight short carpal bones of the wrist are organized into a proximal row (scaphoid, lunate, triquetral and pisiform) which articulates with the bones of the forearm, and a distal row (trapezium, trapezoid, capitate and hamate), which articulates with the bases of the five metacarpal bones of the hand. The heads of the metacarpals will each in turn articulate with the bases of the proximal phalanx of the fingers and thumb. These articulations with
Who We Are and How We Got Here its uneven style of progress as old theories (like the idea that modern humans arose in several regions, popular until the early 1990s) are abandoned. He notes Reich's "restraint" in saying little about how human diversity arose: scientists simply do not yet know, but natural selection acted on many genes and phenotypes: it was not a matter of creating "behavioral modernity" with any large mutation. An open letter "by a group of 67 scientists and researchers" including anthropologists, sociologists, historians, and others takes Reich to task for his book, under the heading "How Not To Talk About Race And Genetics".