A gender specialist at the University of Genoa, in Italy, a psychologist at the University of Missouri, in the U.S., and a behavioralist at the University of Roehampton, in the U.K, have found that men are growing taller and heavier at twice the rate of women. In their study published in Biology Letters, the researchers analyzed a century's worth of data in the World Health Organization's database and found evidence of a growing sexual dimorphism in humans.