Since the incoming supply of genuinely interesting stuff is effectively limitless, improving the efficiency with which you discover it just means you’re bombarded with books, articles, podcasts and videos that seem like they might contain a nugget of wisdom critical for your happiness or professional success. The challenge isn’t to locate a few needles of relevance in a haystack of dross. The challenge, in the words of the technology critic Nicholas Carr, is figuring out how to deal, day in day out, with ‘haystack-sized piles of needles.’