Barb Shaeffer, 85 when this photo was taken, works on one of the two crossword puzzles she did every morning in her kitchen in Chicago, Illinois, August 16, 2012. Shaeffer is part of a Northwestern study of superagers, elderly people who continue to stay cognitively sharp even as they age.
Barb Shaeffer, 85 when this photo was taken, works on one of the two crossword puzzles she did every morning in her kitchen in Chicago, Illinois, August 16, 2012. Shaeffer is part of a Northwestern study of superagers, elderly people who continue to stay cognitively sharp even as they age. Heather Charles MCT
Barb Shaeffer, 85 when this photo was taken, works on one of the two crossword puzzles she did every morning in her kitchen in Chicago, Illinois, August 16, 2012. Shaeffer is part of a Northwestern study of superagers, elderly people who continue to stay cognitively sharp even as they age. Heather Charles MCT

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    President Donald Trump addressed the nation on Monday, a day after 50 people were killed and 400 were injured when a gunman opened fire on a Las Vegas concert. He praised the speed of Las Vegas police and other first responders who responded to the scene and assured those who were now mourning friends and family "we are here for you."