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The video briefly introduces the concept of a smile.

What is the primary focus of the introduction section?

• The history of smiling

• How to smile effectively

• Different types of smiles

• The significance of a smile

How does a smile affect emotions according to the video?

• It can enhance positive emotions

• It has no impact

• It makes people feel sad

• It only affects the person smiling

Which aspect of smiling is discussed in the final section?

• The biological mechanism of smiling

• The social and psychological aspects

• The cultural differences in smiling

• The economic impact of smiling

What is one of the social benefits of smiling mentioned?

• It helps in making friends

• It increases wealth

• It improves physical health

• It enhances memory

Which psychological effect is associated with smiling?

• Increased stress

• Improved mood

• Heightened anxiety

• Decreased intelligence