We humans love putting things in boxes. Assigning simple categories makes us feel comfortable – but all too often, biology ...

Biological sex is usually described in simple binary terms: male or female. This works well for germ cells (sperm versus eggs ...

For a long time, having children has been a young person’s game. Although ancient records are sparse, researchers estimate that, for most of human history, women most typically conceived their first ...

In 2016, two Japanese reproductive biologists, Katsuhiko Hayashi and Mitinori Saitou, made an announcement in the journal Nature that read like a science-fiction novel. The researchers had taken skin ...

Where do we come from and how did we evolve into the beings and bodies we are today? The new book "Eve: How the Female Body Drove 200 Million Years of Human Evolution" argues for a better ...