Marilyn Rantz knows only too well how vulnerable old age can make us. Her mother fell one day, badly fracturing her shoulder. She owned a wearable device that would summon help at the press of a button, but had left it just out of reach from where she fell. After eight hours on the floor, she was able to crawl to the device and call for help, but the stress of those hours bearing untreated injuries took its toll - within six months she was dead.
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