Mrs. Letman’s class wanted to figure out which brand of paper towel would absorb the most water. They performed an experiment on 4 different types of paper towels. The students measured out 5X5 inch paper towels, to make sure each paper towel was the same size. Once the paper towels were measured, they put 20 seconds on the clock, and placed a paper towel in a beaker of water and observed. After the 20 seconds was up the class squeezed as much water out of the paper towels as possible into a graduated cylinder, then recorded their data. They did this for each paper towel. What is the independent variable in the Paper Towel Experiment?