Yellow eyes are usually a sign of jaundice, which can point to liver disease, blocked bile ducts, or blood disorders. Here's what causes it and when to see a doctor.
Mild fibrosis often causes no symptoms, but it can progress. Learn what causes it, how it's graded, and whether it can be reversed with the right care.
Public health informatics uses data and technology to track disease, protect communities, and inform policy. Learn how it works and where it can take your career.
Mitochondria evolved around 1.5 billion years ago when an ancient bacterium merged with another cell. Here's what we know about how and why it happened.