OK, the bible does not say that angels crossed with humans and produced giants, that story come from another book, not the bible. The bible does say that before and after the flood there were giants on the earth, and I have not been able to trace their ancestors back to Adam or Noah. There was a cross between angels and women but they were not giants, just men of unusual ability. So there are two things, the sons of angels before the flood, and the giants who were before and after the flood. Most folks who call the giants the sons of angels are quoting from another book, not the bible. Where did the giants come from, that is a good question, I have wondered if they were even from the human race. Maybe the sasquatch are the giants of today hiding out, he,he?