Biologists mapping the human microbiome expected to find new bacteria and viruses, not entities that slip through every ...

Biological sex is the sole basis for defining the words “male,” “female,” “father,” and “mother,” according to new guidance published Wednesday afternoon by the Department of Health and Human Services ...

Biologists are quietly rewriting what it means to be alive, and the human body has become one of their strangest frontiers.

Amid the legal theater in the U.S. over sex and gender identity—triggered by a Trump administration decree that “‘sex’ shall refer to an individual’s immutable biological classification as either male ...

The Department of Health and Human Services (HHS), under the leadership of Robert F. Kennedy Jr., will define sex as an "immutable biological classification" and only recognize two sexes, male and ...