A study published in the very prestigious science journal Psychological Medicine, reported that people in the higher IQ ranges (scores of 120 or more), are happier than those in the lower ranges (scores of 77-99). The researchers from University College London made this discovery following a very large survey of 6870 participants, whose IQ was estimated based on their scores on a simply reading test (the NART). The participants were also surveyed about their happiness and asked to rate themselves on a three-point scale as “very happy,” “fairly happy” or “not too happy.” The unhappiest group consisted of more low IQ people than the “very happy” group. Low IQ is related to poverty and poor mental health, both of which can lead to unhappiness. The researchers suggested that any interventions that can raise the IQs of children, might ultimately lead to higher levels of happiness. See the [original scientific paper](http://journals.cambridge.org/action//displayAbstract?fromPage=online&aid=8698047&fulltextType=RA&fileId=S0033291712002139).