I love your illness-identifying device. It is a truly groundbreaking product that will help doctors like me diagnose diseases quicker, even a hundred years after your death. Before you die though, could you find a way to make it run on battery power? Reliable electricity access is rarer in the future than it is in your present.
Thank you again, Dr. Chen
PO Box 159 at the Brooksdale Post Office is a bit unusual. Every week, it receives letters from many different people from many different times in the future. Many times, the letters are well-wishes and advice from the loved ones of people of our time. Other times, there are dire warnings.
No one seems to know how or why these letters started coming to PO Box 159. They simply appear. The future these letters describe seems to be in constant flux; one day the year 2098 sounds like a dystopian hellscape, the next day a letter will appear describing a garden of Eden.