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• Rubber stiffens as it cools and stops springing back quickly into the gap it is meant to fill — which is how the space shuttle Challenger was lost in 1986, after a freezing night on the launch pad left its booster o-rings too hard to seal.

  o-ring — dictionary →

• Those are the warp — strung on the loom first and held under tension. The weft is what the shuttle carries across them, over and under, row by row. A handy reminder: the weft goes left and right.

  weft — dictionary →

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