ence rates per 10,000 for 32 countries, induding the USA, Canada, and several European, African, and Asian countries, but no South-American country (Haas, Ddongchamps, Brawley, Wang & De la Roza, 2008). 2D:4D digit ratio The 2O:40 is the ratio between the lengths of the index finger by the ring finger, and has b