Drugmakers claim that broad state PFAS laws are overly burdensome. But environmental health experts aren’t convinced.

Longstanding regulatory and testing gaps have historically been filled by third-party groups with questionable methods.

A massive Swedish study examined hormonal birth control risks. But the nuances of such studies get lost on social media.

Hidden Guests” explores how the emerging field of microchimerism is upending medicine, genetics, and our sense of self.