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Bacterial rheotaxis is ENHANCED in non-Newtonian fluids! (now with image) A collaboration with Arnold Mathijssen, Albane Thery, and non-Xers. Read about our experiments and simulations in our new PNAS manuscript at pnas.org/doi/10.1073/pn…… Mechanical Engineering and Applied Mechanics, Penn Penn Engineering APS DSOFT The Society of Rheology

What do #bacteria and #salmon have in common? They can both swim #upstream! We found that this motion against flows is enhanced in natural polymer fluid environments. Just published in PNAS!!! Congrats to Bryan, Albane, Ran, Quintin, and Paulo E. Arratia!! pnas.org/doi/10.1073/pn…

Out today Science Advances at science.org/doi/10.1126/sc…. We Yinding Chi report a highly deforamable magnetic kirigami dome metasheet for dynamic shape shifting, yet strong enough for heavy non-magnetic object manipulation without grasping. We thank the funding support from U.S. National Science Foundation.

Layered aquatic microenvironments control fluctuations generated by active carpets, Felipe A. Barros et al Felipe Barros Francisca Guzmán-Lastra 🌳 Arnold Mathijssen Hugo N. Ulloa #SoftMatter #ActiveMatter go.aps.org/3WZEbEi

Researchers at Penn, led by Physics and Astronomy professor Arnold Mathijssen, have discovered ways to achieve quality coffee extraction using fewer beans. l8r.it/FMdU

⚛️ 🕰️ My new cover for Nature Magazine: Mysteries of Time ⏳⏱️ #Atomic_clocks measure time by tracking the movement of #electrons from one energy level to another. They are currently the gold standard🥇 in precision time-keeping. But #nuclear_clocks, which rely on different

Renormalisation is a central concept in modern physics. It describes how the dynamics of a system change at different scales. A great way to understand and visualise renormalisation is the Ising model (some math, but one can follow without it ) 1/13

Thrilled to celebrate the 6th PhD graduate from our lab, Dr. Emily Chen! 🎉 Emily's work elucidated how pore geometry & fluid rheology influence elastic instabilities of complex fluids in porous media. 🌊🌪️🔬 She now moves on to address problems in biological physics! 🦠

nytimes.com/2025/04/23/sci…

Trending in #Mechanics: ooir.org/index.php?fiel… 1) Water jet mixing & granular bed with avalanches 2) Two acoustic modes & a gravity wave (Journal of Fluid Mechanics) 3) On roof shapes 4) Focusing of spherical capsule in pulsatile flows 5) Edible films based on gum tragacanth and gelatin

Check out this video: cnn.com/2025/05/08/sci…