What are emotions? How would have emotions come into existence? Are emotions necessary?

A glass of water is half empty for some, and half full for some.

A problem may be challenging for some and troublesome for some.

We seem to associate emotions with our observations. Again, associating either emotions with our observations can lead to bias. The research can get flawed. We just saw some time ago because humans can get mocked they just left out important observations out of their research.

Trying to understand emotions.

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