Drawing inspiration from an impressively diverse range of sources, Duff McDonald starts to let go of his attachment to the false security of precision, going deeper into what it means to be present—in his work, his relationships, and what he calls the “science of experience.” Part jeremiad, part memoir, Tickled is a quirky guide to bringing joy and love into your life right now. He writes, “What should I have been doing? I should have been focusing on things that I love, not the things that anger or annoy me. I should have been focusing on things that tickle me.” When something tickles you, you are experiencing presence. You are alive and you are doing something that you love. The exploration of joy and presence—experiences that tickle—is at the heart of McDonald’s unusual, moving, and profound book.