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If you read his speech at Rice, all his arguments for going to the moon work equally well as arguments for blowing up the moon, sending cloned dinosaurs into space, or constructing a towering *****-shaped obelisk on Mars. --Randall Munroe
Don't know if abandon is the right word. But I suspect that Zachariah may have been called away by real life (hopefully nothing too serious). He may have even been the person playing Caelum.