Board Thread:Questions and Answers/@comment-25069771-20140616130529/@comment-220364-20140618025827

If were playing this came... From the various story points over the years: And Tupka is right - Ignore "modern" science. Pretty much the entire explanation of Kryptoinian appearance, Kryptonian powers, the destruction of Krypton, and kryptonite fails basic physics, chemistry, geology, biology, and any other science.
 * The assumption is that all of the organisms that evolved on Krypton are affected the same way when exposed to an Earth-like environment. Between the lower gravity and the different solar spectrum, they gain invulnerability; superhuman strength, speed, senses, and intelligence; heat vision, flight, etc. This is the case for the humanoid, ape-like, dog-like, and more fanciful fauna of Krypton.
 * Kryptonite is most often explained as a transformed element. Prior to Krypton exploding it did not exists. Full stop. When Krypton exploded, the minerals that made it up underwent a tansformative process. This resulted in:
 * All of it becoming radioactive. All but negligible in effect to humans, but extreme in effect on Krptonian fauna.
 * Most of it be coming one "element" - almost all of the planet's mass became green kryptonite.

And as for "Organisms that evolve in an environment aren't made weaker by it."... Sunstroke, hypothermia, dehydration, uranium, lightning, and many, many other aspects of the environment of Earth can and do weaken and kill human beings. We evolved here and our home habitat isn't really that friendly to us.