TIL estrogen is responsible for the "masculinization" of male brains in early development. Newborn female mice exposed to estrogen will even go on to exhibit male behavior, such as mounting other female mice. Estrogen also plays important roles in memory, stroke prevention, and overall brain health.
https://www.reddit.com/r/todayilearned/comments/15qymmj/til_estrogen_is_responsible_for_the/
