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At Hearthstone Alzheimer's Care, a home-care aide helps a retired Marxism professor with late-stage Alzheimer's play "treasure hunt," a game that involves a tub of shells, starfish, rocks and sand. The player is encourage to touch the objects usually in search of a treasure the home-care aide places under the sand. Children's games are used at nursing homes across the United States to comfort residents. (Rebecca Rosenberg/CNS)