From Old Age to Pollution, Science Keeps Changing How We Understand Illness
Just a generation ago, heart disease and other chronic diseases like dementia were felt to be an inevitable consequence of getting old. Since the 1960s, however, we have learned that only a small percentage of chronic diseases are explained due to genetic origins.
old age pollution science keeps change understand illness generation ago heart disease chronic disease like dementia feel inevitable consequence get old  learn small percentage chronic disease explain genetic origin