Eye color for a plausible argument stating that some eyes can or do change, based on chemical reactions and hormonal changes within the body. Studies on Caucasian twins, both fraternal and identical, have shown that eye color over time can be subject to change, and major demelanization of the iris may also be genetically determined. Most eye-color changes have been observed or reported in the Caucasian population with hazel and amber eyes. Carleton Coon created a chart by the original Martin scale. The numbering is reversed on the scale below in the (later) Martin–Schultz scale, which is (still) used in physical anthropology.
American Journal of Physical Anthropology statistics; not even standard deviations were allowed into his journal during his 24 years as editor-in-chief. After his death, the journal continued as the organ of the American Association of Physical Anthropologists, which Hrdlička had founded in 1930. Like the field of physical anthropology, the journal has grown and developed into research areas far beyond its origins. It publishes research in areas such as human paleontology, osteology, anatomy, biology, genetics, primatology, and forensic science. In 2009, the journal was selected by the Special Libraries Association as one of the top 10 most influential journals of the century in the fields