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Last updateWed, 01 Oct 2014 1pm

The brain needs downs to have ups - Psychology Today (article link)

Happy neurochemicals can’t work if they’re on all the time.

Four neurochemicals cause happiness: endorphins, dopamine, oxytocin and serotonin. Each evolved to do a different job. When you know what the job is, you know why your happy chemicals can't be on all the time.

http://www.psychologytoday.com/blog/greaseless/201105/the-brain-needs-downs-have-ups