Every species has a unique DNA structure, it will differ one from another. Someday, there’s a biotechnology to create anti-DNA. Specifically each creature can be identified its DNA structure and has the anti-DNA. Once you expect certain species to be eliminated, and then let it is.
The technology probably will be in microwave form. Just simply broadcast the anti-DNA microwave, and then certain species will response it in deadly way. If you hate certain people, you can kill them remotely. And people who hate you perhaps will do the same. :D
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The Sand Clock Represents a Long-Last Time Measurement Concept. And so does this blog, as a basket of your wild idea that brings added value to the world.
All Time Vision 
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