Crying is soothing because it carries stress hormones out of our bodies. Feelings of gratitude increase oxygen levels in our tissues, speed healing, and boost our immune system. Being in love was found to raise the level of nerve growth factor, a hormonelike substance that restores the nervous system and improves memory. The effect lasts for about a year, according to researchers. In one study, laughter caused by watching a comedy film increased the flow of beta-endorphins, which enhance our mood, and stimulated growth hormones, which repair our cells. Even the anticipation of laughter was
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