If your child's "cold" has dragged on for weeks, it may not be a cold at all. Pediatrician Cindy Gellner, MD, explains why winter allergies are often mistaken for repeated... You have been out in the ...

How long will we live? And how much of that time will comprise a healthy life? What is aging, and can we slow or delay the aging process? What is the connection between aging and disease? Can we ...

Charles Darwin's Origin of Species is published. Its revolutionary theory of natural selection will have profound effects on both the scientific world and society at large. March 21: Tennessee ...