text: Finally, The FACS could help find if students are depressed or having problems at home. The machine can detect six different emotions, including sadness. This could prove useful when dealing with distressed students. "Eckman has classified six basic emotions-happiness, surprise, anger, disgust, fear, and sadness-and then associated each with characteristic movements of the facial muscles" (D'Alto). This quotes tells the reader about the emotions the machine can read.