Katherine Unger Baillie

People with congenital stationary night blindness, or CSNB, have normal vision during the day but find it difficult or impossible to distinguish objects in low light. This rare condition is present from birth and can seriously impact quality of life, especially in locations and conditions where artificial illumination is not available.

Almost all human beings are exposed to the respiratory syncytial virus, or RSV, before their second birthdays. For most, the symptoms mimic those of the common cold: runny nose, coughing, sneezing, fever.

The University of Pennsylvania's health schools are showing support for World Water Week by highlighting the University's expertise in a broad range of water-related issues. Each day we'll feature a different topic. Follow along and learn more on Twitter at ‪#‎PennOneHealth‬. 

In a new effort, researchers from the University of Pennsylvania and Baylor College of Medicine have used advanced imaging technology to fill in details about the underlying cause of canine diabetes, which until now has been little understood.

“Courtly Treasures: The Collection of Thomas W.

Around the globe, lightning flashes 44 times a second. Contrast that with meteorite impacts, which occur just five to 10 times per year.

The immune system not only responds to infections and other potentially problematic abnormalities in the body, it also contains a built-in brake in the form of regulatory T cells, or Tregs. Tregs ensure that inflammatory responses don’t get out of hand and do damage. In autoimmune diseases, sometimes these Treg cells don’t act as they should.

There is a theory that RNA, instead of DNA, is the original building block of all life. Yet many RNA molecules remain mysterious, their true nature and function little understood.

At a rock outcropping in southern France, a jagged fracture runs along the granite. The surface in and around the crevice is discolored black, as if wet or covered in algae.

In small plastic tubs lining the shelves of a basement laboratory at the University of Pennsylvania, a million organisms live in complex societies.