I have hazel eyes. They turn green when I cry or am angry. They turn green with yellow spikes when I'm at the beach and in the water.

Once had a little girl pull her mom away from me crying, "look at his eyes! look at his eyes!" That's when I found out they turn color.

What causes it? DNA?

I used to be O- blood type and recently went to give blood and was told I was A+. How does that happen????