Is it possible to unmix colors? This short video shows how! Demonstrate laminar flow to your physics class by setting up one beaker inside another and filling the space between them with a viscous liquid such as corn syrup. Place a few drops of food coloring at strategic points and carefully turn the drum to mix the colors. Then by backing the drum up, they return to their original positions! If you aren't up for cleaning up the sticky mess, just include this convenient video clip in your lesson.