You make a good point, odin1, one that was made several times on Star Trek. We are highly arrogant to assume that all life must be centered on DNA. We are foolish to assume that we would find life like ourselves on other planets. No doubt that life form would have its own code of conduct, but that might not include allowing the human race to survive. Something to ponder, anyway. :-)

If you don't care for reality, just wait a while; another will be along shortly. --A Rose