A month ago, I built a personal search engine called Monocle that let me search through a trove of personal information I’ve saved over time, from notes to journal entries to bookmarks and tweets. Shortly thereafter, I switched my default search engine in my web browser from Google to Monocle, marking the start of my slow descent into the fascinating rabbit hole that is transmogrifying my web browser into my best, most flexible, most versatile tool for thinking, learning, and remembering.