Sixteen years ago, on Leap Year Day, my mathematically gifted brother left this world. Felled by glioblastoma, he did not have much choice in the timing of his death. But he did have a flair for drama, and it may have pleased him to give a parting nod to the beauty of numbers. The fact is that he died on February 29, 2004. The emotional truth is that he died not on any old dreary winter day, but on a numerically elegant date that only happens every four years. We memoir writers like to talk about seeking, and writing, the emotional truth. It’s an intuitive concept; more what you feel than what you think. Yes, you tell yourself, when you feel you’ve got it right: what I’ve written is what happened, and why it mattered. Or no, you sigh as you stare at the words on the screen: no, I’m not telling it right. I’m holding back. Or telling the wrong story. Or writing around the heart of the matter, instead of into it. Here’s a famous example of emotional truth, from Ernest Hemingway’s memoir, A Moveable Feast: “I’ve seen you, beauty, and you belong to me now, whoever you are waiting for and if I never see you again,” Hemingway wrote, of a woman who walked in to the café where he was writing; a woman he still remembered three decades later. “You belong to me and all Paris belongs to me and I belong to this notebook and this pencil.” When I teach memoir [...]