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Editing Step 15 —

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Taking care not to sneeze, we tweeze out the rotor/drive gear.

Snuggled up against a penny, this drive gear looks quite inconsequential, but the rotor's permanent magnet enables it to rotate 180 degrees with each pulse of the coil.

Extreme miniaturization means this watch draws very little power—with this configuration, it should last years on a single charge. Apple's claim of "all-day battery life" seems a mite conservative.

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