Memory is built from peaks and endings, not averages

The Heaths lean on established psychological research showing that people don't evaluate an experience by averaging every moment within it; instead, they disproportionately remember the most emotionally intense point (whether wonderful or terrible) and however the experience concluded, largely forgetting the unremarkable stretches in between. This has a counterintuitive implication for anyone designing an experience: making every single moment marginally better delivers far less impact than deliberately engineering one or two genuinely striking peaks, even if much of the rest of the experience remains ordinary. A hospital stay, a customer service interaction, or a multi-day trip will be remembered and judged largely by its best (or worst) moment and its ending, not by a fair accounting of every hour that passed. This reshapes where limited time, money, and creative energy should go: toward a small number of deliberately elevated moments rather than uniform incremental improvement everywhere. Takeaway: instead of trying to improve everything a little, identify one or two moments worth making genuinely exceptional.