At the top of the “astronut pyramid” is Masters student Hang Dong... Hang did a terrific and informative powerpoint presentation on robotics and one of his expeditions to study robots in different environmental situations...then Hang engaged the kids with 2 robots that zipped around on the main floor to the delight of all ...The one the left os called “turtlebot” and the robot on the right is a regular “roomba” vacuum cleaner.