A yellow sun puts out energy in wavelengths that enhance the natural psi powers of the Kryptonian humanoid. All of Kal-El’s powers are a variety of psychokinesis or clairvoyance. Green kryptonite has a radiation which interferes with the Kryptonian metabolism. As it first cancels out the secondary mainfestations of Kryptonians in a yellow-sun environment, the “super powers” are masked well before death occurs. Other varieties of kryptonite have been reported, the differing radiations causing them to be perceived as different colors. The effects of these other radiations are varied, from random mutation in shape to complete elimination of “super powers.”
An Earth human probably would not manifest any “super powers” even under a blue sun, since the fine details of brain structure that control psi abilities in Terrans and Kryptonians are subtly but markedly different.
Dr. Fidelius, Charlatan
Associate Curator Anomalous Paleontology, Miskatonic University
“You cannot reason a man out of a position that he did not reach through reason.”