The motor neuron disease Amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's Disease, progresses in a stepwise, sequential pattern which can be classified into four distinct stages, report pathologists with the Perelman School of Medicine at the University of Pennsylvania in the Annals of Neurology.

Kim Menard ・June 19, 2013

Sperm doesn’t appear to forget anything. Stress felt by dad—whether as a preadolescent or adult—leaves a lasting impression on his sperm that gives sons and daughters a blunted reaction to stress, a response linked to several mental disorders. 

Steve Graff ・June 12, 2013

When a strain of bacteria invades a human body, the immune system responds by generating antibodies to neutralize the threat.

Manasee Wagh ・June 7, 2013

The first-known definitive case of a benign bone tumor has been discovered in the rib of a young Neandertal who lived about 120,000 years ago in what is now present-day Croatia. The bone fragment, which comes from the famous archaeological cave site of Krapina, contains by far the earliest bone tumor ever identified in the archaeological record.

Pam Kosty ・June 5, 2013

A new online course taught by a University of Pennsylvania nursing professor and a nursing educator focuses on aging well, life in an aging society, and seeks to answer that age-old question: how old is old?  

Jacquie Posey June 4, 2013

Cartilage injuries are difficult to repair. Current surgical options generally involve taking a piece from another part of the injured joint and patching over the damaged area, but this approach involves damaging healthy cartilage, and a person’s cartilage may still deteriorate with age.

Evan Lerner ・June 3, 2013

Researchers in the Perelman School of Medicine at the University of Pennsylvania have determined the role of a key growth factor, found in skin cells of limited quantities in humans, which helps hair follicles form and regenerate during the wound healing process.

Kim Menard ・June 2, 2013