Here's a thought to ponder: The intense x-ray/gamma radiation given off by the above-ground nuclear tests may very well be the most powerful indicator of intelligent life on this planet that has ever been broadcast into outer space, purely in terms of signal power. It's kind of sad to think that the first message received by E.T. (if they're out there) could potentially be, "Yes, there are sentient beings on Earth but, unfortunately, they're a bunch of war-mongering a-holes."