City.

The first time we could see by the white line that the train was not
moving.
Each time the green line on the graph was down shows when the little
car goes in front of the light sensor.
The red line is the count of the monorail going to the station touch
sensor.
The mono rail went back and forth more times the second run.
The third time the kids excitedly said "You did it!"
See!
Great thinking.
Here is what the City and Mars look like at Marshall University.
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