Meet Cassie, the Usain Bolt of robots

Cassie's roughly 40 supporters were elated, cheering when it crossed the finish line. Its success was a seminal moment in robotic history, they said. Cassie's speed and agility, honed by artificial intelligence training, showed that bipedal robots could maneuver in taxing real-world situations while maintaining balance, a problem that has plagued designers in the past.