If you know what the digit ratio is [it’s the length of your second finger compared to the length of your fourth finger], the title of this study maybe tells you everything you need to know to appreciate the value of the study:
“Feminist activist women are masculinized in terms of digit-ratio and social dominance: a possible explanation for the feminist paradox.” Guy Madison, Ulrika Aasa [pictured here], John Wallert and Michael A. Woodley, Frontiers in Psychology, epub September 9, 2014. (Thanks to investigator Parker Brown for bringing this to our attention.) The authors are at Umeå University, Sweden, and Vrije Universiteit Brussel, Belgium.
BONUS: Professor John Manning of the University of Liverpool is the big gun, the very index finger, among finger-length-comparison scholars. We have written about many of his exploits. He appears again and again in the new book This Is Improbable Too.