"Your brain operates significantly better at positive than it does at negative, neutral, or stressed...your brain is 31% more productive at positive than it is at negative, neutral, or stressed." To become more positive, try "...reverse the formula" for happiness, and "...become positive in the present."
Try this exercise to become more positive. "Write down 3 new things (your are grateful for) a day for 21 days in row." Also, include "random acts of kindness..." and positive praise to others via "e-mails" or other forms of communication.
"In a 2 minute span of time for 21 days in a row" your brain may rewire itself "to operate more optimistically..." and "scan the world for the positive and not the negative."
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TEDTALKS - Shawn Achor