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THE ALIENS ARE AMONG US!

"Where is everybody?" Nobel Prize–winning physicist Enrico Fermi once asked after a discussion about the possibility of intelligent life elsewhere in the universe. To sum up the Fermi Paradox, if the billions of stars in our galaxy have planets with intelligent life on them, why hasn't anyone visited us?

But maybe they have, and we just haven't noticed—and that's the way they want it. And if they are here in secret, why are they here? Are they tourists? Anthropologist...