Human blood already comes in a bewildering variety of types, but researchers have now identified a new one so rare that only three people on the planet are known to carry it. The finding exposes just ...

Today, we all understand the importance of blood type, but that's actually a relatively recent discovery. Before the 1900s, doctors believed all blood was the same, which unsurprisingly led to a lot ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

A college student in Illinois writes, “I’ve always been interested in nutrition and one of the things I see popping up all the time is something called the ‘Blood Type Diet.’ I know that losing weight ...

A routine medical test turned extraordinary for a woman from the Caribbean when doctors found something completely new in her blood. Nearly 15 years ago, while preparing for surgery in Paris, doctors ...