The third graders wrapped up their studies of simple machines with a lab involving the screw. Using the principles created by Archimedes over 2,000 years ago, third graders made water go uphill. Using PVC pipe and plastic tubing, they moved water (tinted Grinchy Green) from a tub, up the tube, and out the top into a measuring pitcher. The groups got into a competition to see who could move the most milliliters of water and students were fascinated by the Archimedes Screw Pump. Some students were even willing to stay in from recess to keep using the Archimedes screw until their tub was empty.