In mammals, the sex of a baby is determined by the chromosomes it inherits from its parents. But, the combination an animal inherits can be quite different.
Sure, there are physical differences but outside of mammals, the terms "male" and "female" take on different meanings.
Medically speaking, it's generally known that when it comes to being pregnant and giving birth, younger is better. Learn more on this Moment of Science.
Fly often? If you do, who gets the arm rest? You? Or your neighbor?
The human skeleton offers great insight into a person’s life. It will show the signs of disease, malnutrition, and injuries, as well as aging and sex. Experts can identify a skeleton’s sex by looking at two key areas: the skull and the pelvis.
There’s a common belief that men can sire children until they die, but that women need to be relatively young to conceive healthy children. But the father’s age affects the child’s health too.
Male lactation: Fact of fiction? That’s the question on today’s Moment of Science. In 1979, a scientist concluded that there is no insurmountable physiological reason that men can’t lactate, or produce breast milk. In fact, there are a couple of cases where elderly men who received estrogen to treat prostate cancer were actually induced to [...]