Counter-Rotation Inside a Glass of Beer Shaken Stirringly

A round of surprise appears in a glass of beer—or a glass of coffee or tea—when you shake it stirringly. Details are in this study: “Counter-Rotation in an Orbitally Shaken Glass of Beer,” Frédéric Moisy, J. Bouvard, and Wietze Herreman [pictured below], EPL [Europhysics Letters], vol. 122, no. 3, no. 34002, 2018. The authors, at Université […]

Birth-Fluid Dynamics, and the Splashy Hydrodynamics of Urination

Aatish Bhatia (of  Empirical Zeal) alerts us to an outpouring of soon-to-be-announced birth-centric and micturation-modulation fluid dynamics insights. Anne Staples [pictured here], of Virginia Polytechnic Institute and State University, will chair a session on “Pumping Phenomenon“, at the American Physical Society’s 66th Annual Meeting of the APS Division of Fluid Dynamics,in Pittsburgh, Pennsylvania, on Sunday, […]

Male Scientists Demonstrate that Ejaculated Fluid is Conceivably Dual-Use

Three male scientists (all of them humans) go to great lengths to demonstrate that females (at least if they are flies) can, should they want or need to, regard ejaculate as a dual-use fluid. Their study is: “Elucidating the function of ejaculate expulsion and consumption after copulation by female Euxesta bilimeki,” Christian Luis Rodriguez-Enriquez, Eduardo […]

Jogging on / kitchen-sinking into muck

In this video for New Scientist, Chris Chiswell jogs on the non-Newtonian fluid known as cornstarch-mixed-with-water, until he stops jogging and sinks into it, demonstrating the non-Newtonianness of the muck. The ingredients of the goo—cornstarch and water—are commonly found in kitchens, thus this demonstration shows an example of kitchen sinking. (Thanks to investigator Alicia Weston […]