A Bimanual Robot for Dynamic Manipulation AthenaZero just made the September cover of Science Robotics. {📌 Worth saving. I linked the full RAI Institute blog further down in the post if you want to dive deeper into AthenaZero’s design and control approach.} Researchers at the @rai_inst built a low-inertia bimanual robot to study one of the hardest problems in robotics: dynamic manipulation. And the first demos are pretty wild. AthenaZero can throw, catch and bat a baseball at speeds approaching human performance. • Throwing: up to 113 km/h • Catching: up to 66 km/h • Batting: around 50 km/h • Catching and batting over just 7.3 meters That short distance puts serious pressure on reaction times. But the interesting part isn't baseball. Most robot arms use high gear ratios that make them strong and precise, but also stiff and difficult to move compliantly during contact. AthenaZero takes a very different approach. Its arms use low gear ratios, as low as 5:1 in most joints, and have an effective mass at the wrist of only 3.97 kg. That's much closer to a human arm than a conventional collaborative robot. The result is a robot that can accelerate quickly, react to changing trajectories and absorb contact instead of simply fighting against it. The researchers demonstrated robot-to-robot and human-to-robot catching and batting, with the robot continuously adapting its motion to the incoming ball. Dynamic manipulation remains one of the hardest open problems in robotics. But systems like AthenaZero show what becomes possible when robots are designed for fast, physical interaction from the beginning. Blog: —— Weekly robotics and AI insights. Subscribe free: