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.
Thorn in the flesh his other epistles do not directly address the topic. Throughout church history, there has been a significant amount of speculation about what Paul was referring to, although scholars such as Philip Edgcumbe Hughes, F. F. Bruce and Ralph P. Martin conclude that definite identification of the thorn is impossible with the evidence available. The "thorn" is most commonly interpreted as a reference to some form of serious physical infirmity that hindered his work. This is also the earliest known Christian interpretation, mentioned in the early third century in Tertullian's "On Modesty", where it is understood as a reference to ear