Twilight: How Edward's Eye Colors Destroy the Story

 Edward Cullen's irises are sometimes black. Black irises aren't that uncommon among humans, but they are extremely uncommon among humans with light pink skin. I've never known a white person with black irises. Still, I wouldn't think there was something strange about one white human with them. An entire adopted family of humans who were supposedly not related by blood and yet all had black irises would be another matter.

Edward's eyes change color. Not a big deal, a lot of people's eyes appear to change color, like from blue-gray to green to hazel. However, Edward's eyes change from black to ochre. No one's eyes change from black to ochre. It doesn't happen.

( I learned stuff )