Postdocs

The cosmic microwave background, the faint afterglow of the Big Bang that fills all of space, passes through massive galaxy clusters whose motion slightly alters the light, allowing scientists to measure how fast the clusters are moving toward one another and test how strongly gravity pulls across the largest distances in the universe.

(Image: Courtesy of Lucy Reading/Simons Foundation)

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Image: Rabbitti via Getty Images

Image: Courtesy of Penn Engineering

(From left) Xilin Feng, Liang Feng, and Tianwei Wu developed a microring array that allows multiple beams of light to travel simultaneously, protected by topology.

(Image: Sylvia Zhang)

Image: Andriy Onufriyenko via Getty Images

A section of healthy human gum tissue captured using an imaging technique called Second Harmonic Generation microscopy. In this sample, collagen fibers (shown in yellow), which give healthy gums their firm, resilient stiffness, are dense and well-organized—acting as a supportive scaffold for the surrounding cells (shown in teal).

(Image: Hardik Makkar)

To visualize the nanoscale structures, the Tertuliano lab often uses large-scale models like the one pictured.

(Image: Sylvia Zhang)

Image: Christian Petersen via Getty Images

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

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