tweet if you want to be happy – san francisco health and happiness
recently a group of mathematicians at the university of vermont studied twitter’s 140-word posts to determine the happiest and least happy places in the u.s. t
tweet if you want to be happy – san francisco health and happiness
recently a group of mathematicians at the university of vermont studied twitter’s 140-word posts to determine the happiest and least happy places in the u.s. t