HW: 3/14

a. What according to Dr. Niedenthal, is the scientific explanation for smiling?
   - “A smile is not this floating thing, like a Cheshire Cat, It’s attached to a body.”

b. How did Dr. Niedenthal and her colleagues begin to study the science of smiling?
   - they surveyed a wide range of studies, from brain scans to cultural observations, to build a new scientific model of the smile.

c. According to the article, is it correct to say a smile is simply an expression reflecting feelings of happiness? Explain.
   - No, a smile is complicated, because it is related to the circumstance, brain activity, eye contact, etc.
     And sometimes the same muscles contract when people feel sad, or disgusting.

d. What are some of the categories smiles fall into? What are some of the distinguishing features of each?
   - I think smiles fall into all of humans expression - happiness, sadness, pride, kindness, nervous, and so on.
     They can be distinguished by eyes, eyebrows, chin, mouth, lips, zygomaticus muscles, etc. But it's hard to distinguish person's feeling only with facial motion.

e. Is it possible that people use smiles to gain some advantage over others? How?
   - Yes. People can smile to get a good impression to others, and to calm down others feeling.