I am just afraid that, to avoid cognitive decline, we will need to shift to algorithm-design textbooks instead of crosswords before bedtime (same for architectu

I am just afraid that, to avoid cognitive decline, we will need to shift to algorithm-design textbooks instead of crosswords before bedtime (same for architecture). To keep the brain in shape. It will be like going to the gym to lift weights just so you can look muscular, even though you don't need to use those muscles as a bodyguard (probably never).