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How deadly parasites choose to be male
Transcription atlas of Cryptosporidium life cycle.

Penn Vet researchers developed the Cryptosporidium single-cell atlas, revealing which genes are expressed at which points across the parasite’s life cycle. On the left, the atlas shows parasites replicating asexually in green, with males in blue and females in pink. On the right, micrographs of the stages are shown, with their nuclei highlighted in green.

(Image: Boris Striepen)

How deadly parasites choose to be male

Penn Vet researchers reveal the gene expression across the life cycle of Cryptosporidium and identify the determinant of maleness.
How much gossip is needed to foster social cooperation?
One person whispers in the ear of another.

(Image: iStock/AndreyPopov)

How much gossip is needed to foster social cooperation?

Researchers Mari Kawakatsu, Taylor A. Kessinger, and Joshua B. Plotkin in Penn’s Department of Biology developed a model incorporating two forms of gossip to study indirect reciprocity.
A deep dive with Anna Kalandadze
Wearing her swim cap and goggles, Anna Kalandadze sits in the pool with her head above water.

Image: Eric Sucar

A deep dive with Anna Kalandadze

The fourth-year distance swimmer discusses swimming 11,000 yards a day, competing at the NCAA Championships, learning to dive from watching Michael Phelps, her interest in coral reef restoration, and getting circled by a shark.
Bringing cognitive science in action to young minds
Penn Upward Bound student observes birds.

A Penn Upward Bound high school student observed brown-headed cowbird behavior at the Penn Smart Aviary.

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Bringing cognitive science in action to young minds

Penn Upward Bound high school students from West Philadelphia got a tour of the Penn Smart Aviary, GRASP Lab, and the Penn Vet Working Dog Center during a visit to Pennovation Works.