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Consider Miles Davis, horn held high, sculpting a powerful musical statement full of tonal patterns, inside jokes, and thrilling climactic phrases—all on the fly. Or think of a comedy troupe riffing on a couple of cues from the audience until the whole room is erupting with laughter. Or maybe it’s a team of software engineers brainstorming their way to the next Google, or the Einsteins of the world code-cracking the mysteries of nature.