Donald Trump, who has returned to the U.S. presidency, has declared that there are only two genders, male and female, and ...

OPINION What happens when the mem illustrating this article does not work? Lance Lawson on why gender and chromosomes may not align as neatly as many suggest. Christian disputes about the now famous ...

One of the male sexual organ’s main roles is to make procreation happen, but the penis also has cultural significance. Here ...

A UCSF study reveals that maternal X chromosome expression may accelerate brain aging and cognitive decline. Female mice with ...