"As best I could understand it, the Buddha's main thesis was that in a world where everything is constantly changing, we suffer because we cling to things that won't last. A central theme of the Buddha's "dharma" (which roughly translates to "teaching") revolved around the very word that had been wafting through my consciousness when I used to lie on my office couch, pondering the unpredictability of television news: "impermanence."