When NASA added a drone named Ingenuity to its Mars 2020 rover Perseverance, it expected the tiny four-pound helicopter to fly a total of five very brief missions in the thin Martian atmosphere. But Ingenuity far surpassed all expectations, flying dozens of flights before suffering damage to its rotors in January. Correspondent David Pogue reports on how the tiny drone, created from off-the-shelf parts, continued to provide valuable data and images from the Red Planet three years into its mission.