"The only relevant test of the validity of a hypothesis is comparison of prediction with experience."

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What? You can't knit in the dark? Stuff and nonsense; anybody can. Shut your eyes. Knit one stitch. Open your eyes and look at the stitch; it's all right. Shut your eyes and knit two stitches. Open them. Shut them. Knit three stitches. Falling off a log is no comparison.

— Elizabeth Zimmermann