After all, loyal fans of blended Scotch whiskies, which are made differently every year but are always supposed to taste exactly the same, often complain often over seemingly imperceptible changes, and even changes in the water used.

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Her skates are chunks of steel as long as 13 feet (the crew changes skate length according to ice conditions), with an almost imperceptible curve along the bottom and a razor-sharp edge so that the skate bites hard into the ice.

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