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New model could help police departments reduce excessive force incidents

New model could help police departments reduce excessive force incidents

Criminology professor Greg Ridgeway has developed a model that estimates an officer’s likelihood of using a higher level of force than peers in similar situations—an improvement on existing early-intervention systems that don’t account for differences in time and location.
Physics of foam strangely resembles AI training
Six separate piles of foam.

Image: Dowprasook Deenu via Getty Images

Physics of foam strangely resembles AI training

Research by Penn Engineers reveals that as foams flow ceaselessly inside while holding their external shape, and this internal motion resembles the process of deep learning, the method typically used to train modern AI systems.

Ian Scheffler

What makes ice slippery?
An icy bench in a city.

Despite the commonality of water and ice, says Penn physicist Robert Carpick, their physical properties are remarkably unique.

(Image: mustafahacalaki via Getty Images)

What makes ice slippery?

With Winter Storm Fern set to bring the Northeast and other parts of the country icy conditions over the weekend, Penn Today asks physicist Robert Carpick about the unique properties of ice, the science of curling, and how close we are to “nonslip” ice.
Planning ahead in an age of longevity
An elderly person holding a baby while blowing out candles on a birthday cake.

Image: Daniel Balakov via Getty Images

Planning ahead in an age of longevity

Tamara J. Cadet of the School of Social Policy & Practice discusses strategies for preparing—financially and physically— for an extended lifespan.
Connecting Latin American fiction through infrastructure and transit
Left: Valeria Seminario; right: An old illustrated map of the Americas.

Sixth-year Spanish & Portuguese Ph.D. student Valeria Seminario.

(Image: Courtesy of Omnia)

Connecting Latin American fiction through infrastructure and transit

Penn Arts & Sciences Ph.D. student Valeria Seminario’s dissertation explores themes of transportation and infrastructure in 19th- and early 20th-century Latin American fiction.

Marilyn Perkins

Can aging be treated at the cellular level?
A microscope with a slide.

Image: Wladimir Bulgar via Getty Images

Can aging be treated at the cellular level?

Penn researchers Shelley Berger and Esra Sahingur explain senescence, the process of cellular aging, and discuss the complexities of developing anti-aging therapies that target these cells.

4 min. read

How ‘um’ and ‘uh’ shape impressions
Jonathan Lee.

Fourth-year linguistics Ph.D. student Jonathan Lee became curious about breaks in speech when he noticed they were missing from transcripts and subtitles.

(Image: Kevin Ren)

How ‘um’ and ‘uh’ shape impressions

Disfluency, or irregularities and breaks in speech, are part of life—but do they affect how we perceive each other? Fourth-year linguistics Ph.D. student Jonathan Lee is trying to find out.

2 min. read

Working in groups can help Republicans and Democrats agree on controversial content moderation online

Working in groups can help Republicans and Democrats agree on controversial content moderation online

A new study by Annenberg School for Communication professor Damon Centola and alum Douglas Guilbeault explores how content moderators can reach consensus on classifying controversial material online, including inflammatory, offensive, or hateful images.

Hailey Reissman

2 min. read

When employees feel slighted, they work less

When employees feel slighted, they work less

New research from Wharton management professor Peter Cappelli reveals how even the slightest mistreatment at work can result in lost productivity.

From Knowledge at Wharton

2 min. read