But Charles Darwin thought that laughter was really important, and he thought that at its heart, it was an expression of joy; it's a joyful emotion.
चार्ल्स डार्विन ने सोचा हंसी  बहुत महत्वपूर्ण थी, उसने सोचा कि यह खुशी की अभिव्यक्ति थी; यह एक सुखद भावना है.