Maddie visits a robot workshop where they design farming robots that help farmers grow crops. She meets three farming robots, Tom, Wilma and Richard that work together on the farm to help find the weeds in the fields.
Maddie learns that Tom, a scanning robot, can see things we cannot see, using special cameras to scan and take photos of the weeds, animals, insects and crops in the field. Maddie then discovers how Tom sends pictures and information to an artificial intelligence computer called Wilma to build a map of the field.
Finally, Maddie meets another Richard, a robot who uses the map to find and destroy the weeds. Maddie then visits a printing workshop to see how a 3D printer makes things. At the workshop, they design glasses frames to wear and Maddie uses her special camera to see how the 3D printing works by building up layers stacked on top of each other.
