Ive been watching, shall we say, a fair amount of YouTube. You can learn anything there, from post-apocalyptic building techniques to curly hair care to why the face of Venus is so obscure in that painting by Velazquez. You can learn how to keep a plant alive. How to clean your house. If youre vegan, there are beans and cream-free sauces and waifish young people assuring you that baby steps are cool. You can listen to music and watch short films, and hear...