sentences:  Among his other research into digit ratio, Hurd has demonstrated that, while there is no difference in digit ratio between the sexes in most laboratory mice, that pups which gested next to brothers have higher digit ratios than those whose uterine neighbours were sisters, and that the large differences in digit ratios between populations may be explained by Allen's rule and Bergmann's rule.Strongly influenced as a youth by the anarcho-punk movement and such influences as Jonathan Kozol and A. S. Neill's Summerhill School, Hurd was an enthusiastic member of a student run free school group while unenthusiastically attending Colonel By Secondary School.He then completed a BSc at Carleton University, Canada in 1990, followed by an MSc in 1993 from Simon Fraser University.