Faces
S5, E10: With over 40 muscles, your face allows you to express a near infinite number of emotions and feelings. But your brain is also highly adept at recognizing what other peoples' faces are saying to you.

S5, E10: With over 40 muscles, your face allows you to express a near infinite number of emotions and feelings. But your brain is also highly adept at recognizing what other peoples' faces are saying to you.