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Another possibility... there are plenty of civilisations within broadcasting distance from us that are all listening but not broadcasting for fear of predatory civilisations.

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that exact possibility was listed in the article.

That's funny! I read the article and then had that thought five minutes later and thought I'd come up with it. Thanks for pointing that out :)

I often wonder how many of my opinions derive from this same mistaken originality... Quite scary, actually.

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