Coco Khan writes: “Ever thought about a book you’ve read, and had no recollection of the plot? Or followed a recommendation to watch a TV show, only to find you’ve already seen it? We live in an age of mass content, with TV, books and films consumed at some of the highest levels in recent years. Could this be wreaking havoc with our ability to remember them? I asked Dr. Sean Kang, a cognitive psychologist who specializes in memory: why do I keep forgetting the books I’ve read?”