prosopagnosia
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i honestly think i have a mild form. yesterday my neighbour knocked on my door to invite us for dinner. i had no idea who she was, though i knew she was terribly familiar. i cautiously agreed. i then looked out, and saw no car in our driveway. aha, i thought, car keys in her hand, but no car. she must be the one who lives in our semidetached. at least i have some modicum of logic.