How did “rabbit hole,” which started its figurative life as a conduit to a fantastical land, evolve into a metaphor for extreme distraction? One obvious culprit is the Internet, which has altered to an indescribable degree the ways that we distract ourselves. Twenty years ago, you could browse for hours in a library or museum, spend Saturday night at the movies and Sunday at the mall, kill an afternoon at the local video arcade or an evening at its X-rated analogue—but you couldn’t do those things every day, let alone all day and night. Moreover, content-wise, you couldn’t leapfrog very far or very fast from wherever you started, and there was a limit to the depth and nichiness of what you were likely to find; back then, we had not yet paved the road between, say, Dorothy Hamill and a comprehensive list of Beaux-Arts structures in Manhattan, nor archived for the convenience of humankind ten thousand photographs of fingernail art. Then came the Internet, which operates twenty-four hours a day, boasts a trillion-plus pages, and breeds rabbit holes the way rabbits breed rabbits.