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.
Dutch Schultz As Martin contorted on the floor, Schultz apologized to Davis for killing someone in front of him. When Davis later read a newspaper story about Martin's murder, he was shocked to find out that the body was found on a snow bank with a dozen stab wounds to the chest. When Davis asked Schultz about this, the boss dead-panned, "I cut his heart out." At the time of the Martin killing, Schultz was busy fighting a federal tax evasion case; U.S. Attorney Thomas Dewey had set his sights on convicting Schultz. Schultz was convicted of the charges, but they were