The average male height varies across the world. The average male is about 5 feet 9 inches tall in the United States. Factors like genetics, nutrition, and health conditions can affect where you ...

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond ...

In the animal kingdom, pregnancy is usually the role of the female, but a few unique species have flipped this biological norm. Male pregnancy evolved in these species to increase reproductive success ...

Look at one and then the other. Can you tell which brain is female and which is male? You can't. Humanity has been hunting for sex-based differences in the brain since at least the time of the ...