The lettuce grew in the dark and it was the most beautiful thing Elijah had ever seen.
He adjusted the angle of the fluorescent tube by two degrees and watched the leaves respond. Not literally—plants do not respond to light angle changes in real time—but he could feel, in the way a musician feels a wrong note, that the adjustment was correct. The light would hit the upper leaves more directly. The lower leaves would get more. The yield would increase by perhaps three percent...
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