Question

why is sadness better than happiness​

Answer 1

Answer:

A new study shows that -- after looking at a face for only 100 milliseconds -- we can detect expressions of happiness and surprise faster than those of sadness or fear. Our brains get a first impression of people's overriding social signals after seeing their faces for only 100 milliseconds (0.1 seconds).

Answer 2

Answer:

Though happiness is still desirable in many situations, there are others in which a mild sad mood confers important advantages. Findings from my own research suggest that sadness can help people improve attention to external details, reduce judgmental bias, increase perseverance, and promote generosity.