28 problem of the journal Cell. Stem cells key to adaptability Many tissues grow or shrink with use, including muscle, liver and intestine. Human intestines, for instance, regrow after portions have been removed because of cancer or injury surgically, and hibernating animals discover their intestines shrink to one-third their regular size during winter. One technique animals use to deal with environmental variability is certainly to tune the workings of their organ systems to complement the conditions at hand, O’Brien said. How precisely this ‘organ adaptation’ occurs, particularly in adult animals that are no more growing, has long been a mystery.We can perform better – – 46.3 million uninsured is unacceptable for our great nation. ‘Debating the precise number of uninsured shouldn’t be our primary focus; what’s most significant is that all Americans should have usage of high-quality, affordable health coverage. When people have health insurance they get access to the preventive and regular treatment they have to stay healthy. ‘Doctors see firsthand the unwanted effects of living without coverage of health.