School of Arts & Sciences

Karen Reivich, director of training programs at Penn’s Positive Psychology Center, facilitating a resilience workshop.

nocred

Marcia Chatelain’s next book, coming out this fall, is a narrative history of the women who played roles in the 1963 March on Washington.

nocred

nocred

Why do modern humans carry small amounts of Neanderthal DNA almost everywhere in their genome except on the X chromosome? A new study by Alexander Platt and Daniel Harris in the lab of geneticist Sarah Tishkoff suggests the answer lies in ancient attraction. (Pictured) An illustration of a normal karyotype, the full complement of chromosomes arranged in homologous pairs.

(Image: quantic69 via Getty Images)

A view of campus on May 20, 1891, looking northeast toward the corner of 34th and Walnut streets.

(Image: Courtesy of University Archives)

To mark their wedding anniversary, two Yezidi—Khalaf and Hamdya—pose with their son Hegar in Sinjar’s old district.

(Image: Nathaniel Brunt)

Image: Sciepro/Science Photo Library via Getty Images

The annual Energy Week Poster Session is a good way to learn about the energy-related research of Penn students and postdocs.

(Image: Bill Cohen)

nocred