(DNF @ 31%) Although I can see why he starts where he does, Lehrer’s early focus on attachment and attunement – two psychological theories of how babies learn to relate affectionately to others – means the book gets bogged down in studies performed on mice and/or children and feels more like a parenting book than anything else. (If that’s what you’re after, read All Joy and No Fun.) A glance at the table of contents suggests the rest of the book will go into marriage, divorce and how love changes over time, but I couldn’t be bothered to stick around. That said, Lehrer’s popular science writing is clear and engaging, and with the heartfelt mea culpa at the start of this book I couldn’t hold a grudge about his earlier plagiarism scandal.