Charles II of Spain became infamous as Europe’s most inbred king. Centuries of royal intermarriage left him with the Habsburg jaw, severe health issues, and infertility that ended his dynasty. This ...

Habitat loss is putting the timid wetland reptiles in a genetic bind. By Laura Baisas Published Aug 18, 2025 3:00 PM EDT Get the Popular Science daily newsletter💡 ...

Purebred dogs might look flawless on the outside, but their beauty often hides a disturbing genetic truth. For generations, breeders have prioritized traits like coat color and snub noses over genetic ...