In many cultures, men are not involved with hands-on childcare. But biology tells us we are perfectly capable of doing so ...

Male ruffs have the ability to eliminate excess sex hormones from their bloodstream. We often associate high testosterone ...

A gene regulating testosterone in ruffs produces three male morphs with unique behaviors, offering insights into vertebrate ...

Since then, many more options have arrived: different pill formulations; hormonal implants, patches and vaginal rings; IUDs and barrier methods. But over the last 60 years, exactly zero new options ...