Scientists have discovered fossils suggesting that early female humans (hominids) were significantly smaller than their male counterparts. What does this mean? According to Reuters, this means that "mankind's upright ancestors may have been physiologically closer to modern gorillas and chimpanzees, which also exhibit big differences in size between males and females, than had been supposed." And! "This could also mean the sexual behavior of Homo erectus was more like that of apes, where individuals, especially males, mate with several partners, sometimes in a few hours, than that of its more monogamous human successors." [Reuters]