People learn something every day, and a lot of times it’s that what they learned the day before was wrong.

Bill Vaughan (1915–1977) was an American newspaper columnist and humorist whose syndicated pieces often used wry, plainspoken observations to puncture certainty and self-importance. This line reflects the mid‑20th‑century columnist’s habit of turning everyday experience—reading the news, following public debates, watching “expert” opinion shift—into a compact joke with a serious underside. Vaughan wrote during decades when science, politics, and social norms were rapidly changing, and his humor frequently highlighted how quickly yesterday’s confident “facts” can be revised by new evidence or better thinking.

The quip turns learning into a double-edged process: gaining new knowledge often means unlearning what we previously believed. Vaughan’s humor rests on the deflation of certainty—people congratulate themselves for learning “something,” only to discover that the real lesson is their earlier error. Beneath the joke is an epistemological point: knowledge is provisional, and intellectual maturity includes revising beliefs in light of new information. The line also satirizes overconfidence in received wisdom and “common sense,” suggesting that progress—personal or societal—depends less on accumulating facts than on the willingness to admit and correct mistakes.