The latest study on America's state of mind is in, and it reveals a concerning rise in the share of adults who say they have problems with memory , decision-making, or concentration – known collectively as cognitive disability. A US team led by University of Utah neurology researcher Ka-Ho Wong found that those aged 18–39 experienced the biggest uptick in cognitive disability in the past decade, after analyzing survey data from more than 4.5 million people. Overall, the proportion of US adults