"I simply can't imagine the world will ever be normal again for us. I do talk about "after the war," but it's as if I'm talking about a castle in the air, something that can never come true."

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The edifice of science not only requires material, but also a plan. Without the material, the plan alone is but a castle in the air-a mere possibility; whilst the material without a plan is but useless matter.

— Dmitri Mendeleev