3,000 years ago, on a battlefield in ancient Palestine, a shepherd boy felled a mighty warrior with nothing more than a stone and a sling. He shouldn’t have won. Or should he have? In David and Goliath, Malcolm Gladwell challenges how we think about obstacles and disadvantages, offering a new interpretation of what it means to be discriminated against, or cope with a disability, or lose a parent, or attend a mediocre school, or suffer from any number of other apparent setbacks.