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The more you spend on others, the happier you feel.

Studies have suggested that losses are, psychologically, twice as powerful as gains. So winning $100 feels as good to us as losing $50 feels bad.

Unexpected Reinforcements Work Best. When rewards are unexpected, there are better chances of a good performance next time.

Some lies are easier to remember than others.

Psychology says the person you care about the most can literally shatter your confidence with their opinions.