He has told the BBC he was on a "moral crusade" to prove US intelligence had found an alien craft run on clean fuel.

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And so, in due course, the alien craft arrive: tetchy pilotless drones in the shape of pizzas, from which individual slices peel off to launch spicy, deep-crust attacks on defenseless mortals.

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These efforts are notable because so few other attempts have been made to craft a message to alien civilizations.

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