Penumbra: Overture website & publisher announced

[Thomas]

Well radiation do cause mutation. The thing is that since only a single cell is mutated and that mutation does not cause the entire animal to get changed, this can cause cancer and stuff though.

However when an egg or sperm cell gets mutated the mutation may be part of the offspring. And when that happens you can get all sorts of strange outcome. Mutations also happen naturally but are quite rare, radiation makes it all alot more common.

That is my amature biologist explaination Please correct me if I am wrong.