_____ Why I’m Dig­ging Deep Into Alzheimer’s (Bill Gates): “In every part of the world, peo­ple are liv­ing longer than they used to. Thanks to sci­en­tif­ic advance­ments, few­er peo­ple die young from heart dis­ease, can­cer, and infec­tious dis­eases. It’s no longer unusu­al for a per­son to live well into their 80s and beyond. My dad will…