Interesting that testosterone levels did test as higher in Mexican-American men. What does that say about race? My opinion is that culture (belief systems, activities, ways of relating in different cultures, etc.) and climate (which can greatly influence culture) play large roles in the differences we see, with our own eyes, between races. That said, there is such a wide difference within each race, that we should never stereotype anyone strictly according to their race. To me, "race" is just a family lineage, primarily, and has a lot to do with the geographic area where one's ancestors spent most of their time.