Boston Dynamics is focused on building free-moving legged robots. ReThink was focused on building industrial robots (think robot arms) that can easily be train

Boston Dynamics is focused on building free-moving legged robots. ReThink was focused on building industrial robots (think robot arms) that can easily be trained/retrained to do a wide variety of tasks and that can co-exist with humans (torque sensors tell them when they’ve hit something unexpected and tell the arm to stop before it crushes you). The idea was that smaller manufacturing settings could use them side by side with human workers, and that a single arm could be retrained frequently as tasks change over time. This is compared to traditional industrial robots which have to be completely cordoned off from humans lest they run into them, and which require extensive programming to execute a new task.