Why facial expression? By @mm-writes

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Often times we find expression through different ways that we cant control.

Sometimes, when we are angry we try as much as possible not to make it obvious but the truth is as some point or the other people who are observant enough get to understand our mood based on our facial expression.

Likewise when we are happy, our joy is first known when people look at our smiling face.

Also, it becomes very difficult to cover up your emotions on your face for people to read your mood. My question is: are there other ways to cover up your facial expressions?