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In David Brin’s ‘Existence,’ a sci-fi journalist relies on credible smart mobs and ubiquitous connection

If you want to have an idea of what the future (or various futures) might look like, I hope you’re a fan of science fiction. The best sci-fi novelists, including author/futurist/scientist David Brin, are adept at extrapolating possible futures based on emerging technologies, scientific discoveries, and societal trends that are just beginning to exhibit themselves…