I usually fill my mind with random facts. I'm an old movie fan so I run down present actors/actresses versus those of the golden age. I find it a more intellectual parallel to the old "Could Superman kick the Hulk's ass?" school of thought. Anything to occupy the mind helps.

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Deep into that darkness peering,
long I stood there, wondering, fearing,
Doubting, dreaming dreams
no mortal ever dreamed before.