Arobot's job isn't limited to the terrestrial level, either. even in space, machines such as the r2 humanoid robot at the international space station complete dangerous tasks for astronauts, protecting them from potentially deadly situations. and then, when there are mundane but essential tasks to conduct on the space station, r2 takes care of those, as well, freeing up the astronauts' time for more important responsibilities. thus, in space and on earth, robots manage to create healthier, happier humans. what is the main idea '