The word "key" does not reveal if it's positive or negative, just that it's important. On the other hand - nor does the article. Variance could be explained not

The word "key" does not reveal if it's positive or negative, just that it's important. On the other hand - nor does the article. Variance could be explained not only by testosteronje levels, but also by behavior and environemnt. You know - men and women differ.