De megfigyeltek...
"Testosterone is the primary male sex hormone...
...
There are some differences between a male and female brain (possibly the result of different testosterone levels), one of them being size: the male human brain is, on average, larger. Men were found to have a total myelinated fiber length of 176,000 km at the age of 20, whereas in women the total length was 149,000 km (approx. 15% less).
...
No immediate short term effects on mood or behavior were found from the administration of supraphysiologic doses of testosterone for 10 weeks on 43 healthy men. A correlation between testosterone and risk tolerance in career choice exists among women."
https://en.wikipedia.org/wiki/Testosterone
Marmint ertem, hogy a biologia nem szamit, de akkor mi? :)