how do the robots not float away

Question: how do the robots not float away
- Keywords:
  float,
  robot
Asked by BuzzBea to Elie, Col Op, Floris, Jenn, RocketRich on 18 Mar 2016. This question was also asked by THE BIG MAC.
- Richard Moss answered on 18 Mar 2016:
  
  You are right, left alone any object including robots would simply float away. We always attach one part of the robot to the space station, like gluing one of your feet to the floor! The robot can still move to work, but not float away.

Question: how do the robots not float away