Most of them are caused by radioactive bug bites.
"Most of them are caused by radioactive bug bites."
Ok...now I'm confused. Is it the bugs or the bite that's radioactive? Maybe it's just the bug juice they put in the bite that's radioactive.
I remember when I was a kid that it was a well known fact that grasshopper juice was seriously poisonous. You didn't dare get it on you when you held the hopper.
Maybe that's where all the mutational birth defects come from...kids who don't hold their grasshopper properly. Man! This is a breakthrough! Kill all grasshoppers while we're still human. Stop mutations!