Afriel smiled genuinely, unaware of the chilling sarcasm of his expression. "And the personal profit, Doctor...the valuable expertise of the first to exploit the technique." He spoke gently, quietly. "Ever see a nitrogen snowfall on Titan? I think a habitat of one’s own there—larger, much larger than anything possible before...A genuine city, Galina, a place where a man can scrap the rules and discipline that madden him..."