Physical anthropology in the context of "Hominini"

The three-age system is the division of human prehistory (with some overlap into the historical periods in a few regions) into three time-periods: the Stone Age, the Bronze Age and the Iron Age, although the concept may also refer to other tripartite divisions of historic time periods. In some systems, a fourth Copper Age is added as between the Stone Age and Bronze Age. The Copper, Bronze and Iron Ages are also known collectively as the Metal Ages.

In history, archaeology and physical anthropology, the three-age system is a methodological concept adopted during the 19th century according to which artefacts and events of late prehistory and early history could be broadly ordered into a recognizable chronology. C. J. Thomsen initially developed this categorization in the period 1816 to 1825, as a result of classifying the collection of an archaeological exhibition chronologically – there resulted broad sequences with artefacts made successively of stone, bronze, and iron.

Scientific racism, sometimes termed biological racism, is the pseudoscientific belief that the human species is divided into biologically distinct taxa called "races", and that empirical evidence exists to support or justify racial discrimination, racial inferiority, or racial superiority. Before the mid-20th century, scientific racism was accepted throughout the scientific community, but it is no longer considered scientific. The division of humankind into biologically separate groups, along with the assignment of particular physical and mental characteristics to these groups through constructing and applying corresponding explanatory models, is referred to as racialism, racial realism, race realism, or race science by those who support these ideas. Modern scientific consensus rejects this view as being irreconcilable with modern genetic research.

Scientific racism misapplies, misconstrues, or distorts anthropology (notably physical anthropology), craniometry, evolutionary biology, and other disciplines or pseudo-disciplines through proposing anthropological typologies to classify human populations into physically discrete human races, some of which may be asserted to be superior or inferior to others.

The term Japhetites (sometimes spelled Japhethites; in adjective form Japhetic or Japhethitic) refers to the descendants of Japheth, one of the three sons of Noah in the Book of Genesis. The term was used in ethnological and linguistic writings from the 18th to the 20th centuries as a Biblically derived racial classification for the European peoples, but is now considered obsolete. Medieval ethnographers believed that the world had been divided into three large-scale groupings, corresponding to the three classical continents: the Semitic peoples of Asia, the Hamitic peoples of Africa, and the Japhetic peoples of Europe.

The term has been used in modern times as a designation in physical anthropology, ethnography, and comparative linguistics. In anthropology, it was used in a racial sense for White people (the Caucasian race). In linguistics, it referred to the Indo-European languages. Both of these uses are considered obsolete nowadays. Only the Semitic peoples form a well-defined language family. The Indo-European group is no longer known as "Japhetite", and the Hamitic group is now recognized as paraphyletic within the Afro-Asiatic family.

The concept of race as a categorization of anatomically modern humans (Homo sapiens) has an extensive history in Europe and the Americas. The contemporary word race itself is modern; historically it was used in the sense of "nation, ethnic group" during the 16th to 19th centuries. Race acquired its modern meaning in the field of physical anthropology through scientific racism starting in the 19th century. With the rise of modern genetics, the concept of distinct human races in a biological sense has become obsolete. The American Anthropological Association's 1998 "Statement on Race" outlined race as a social construct, not biological reality. In 2019, the American Association of Biological Anthropologists stated: "The belief in 'races' as natural aspects of human biology, and the structures of inequality (racism) that emerge from such beliefs, are among the most damaging elements in the human experience both today and in the past."