All kinds of simple machines on our hike today! @TheOutdoorLab @CampbellAPS
All kinds of simple machines on our hike today! @TheOutdoorLab @CampbellAPS https://t.co/dotsK8OF1m
All kinds of simple machines on our hike today! @TheOutdoorLab @CampbellAPS https://t.co/dotsK8OF1m