text: Studies have found that when you are sad and fake a smile it can make you just a little bit happier. When moving your facial muscles it not only shows emotions, but also can produce them. When studying a lesson and a child is looking sad' the software could alter the lesson to, lets say, make the child laugh. Everyone knows that laughter is the best medicine. It may not make the child happy over all but it could brighten their day and make the lesson more appealing.