Everyone knows an elderly relative or friend with a failing memory. It is one of the least pleasant experiences in life, and as dementia progresses, and the person reaches for memories that are no longer there, feelings of frustration and uncertainty increase. Relatives and caretakers worry and may feel helpless, even as the patient themselves denies a problem and may also vary in mental acuity from one day to the next or even from one moment to the next. Gait may be affected depending on the specific diagnosis, and falls become more frequent.Most people would agree that there is a