Watch a rainbow come to life right before your eyes with this super simple but very colorful  "Walking Rainbow" experiment! All you need are cups, water, food colouring, and paper towels.

"What a fun science experiment for kids! Here we are doing the Rainbow Walking Water or Rainbow water, kids science project. It is fun and easy. We got this idea from Whizkidscience. The empty cups fill up and mix colors to form all the colors of the rainbow. This happens because of Capillary Action! Only a few ingredients needed to get started. As a side note: we found the Up and Up brand paper towels work the best. You should see results within a few minutes. If not, try a different type of paper towel." The Science Kid

Find more cool science experiments by The Science Kid here: