Given a labeled image with a wrong claim presented by 'the App' (fooler items), the learner detects the wrongness, taps a 'Wrong!' button, and selects the correct label. The learner correctly catches each of 6 foolers targeting M8 (Moon-glows), M9 (bright=source), M3 (color), M12 (Sun-is-biggest), M5 (boundary at 'in space'), and M1 (Sun-is-qualitatively-different).