This video offers a glimpse into turbulence developing in a classic flow set-up, a Taylor-Couette cylinder. The apparatus consists of two upright, concentric cylinders; the outer cylinder is fixed, and the inner one rotates. (Video credit: D. van Gils)

Water is an endlessly peculiar substance, eager to adopt many configurations. Each molecule can form up to four, highly-directional bonds. In this study, researchers found an unexpected configuration, a 2D type of ice known as bilayer hexagonal ice, on a corrugated gold surface. (Image credit: top - E. McKenna, illustration - APS/A. Stonebraker; research credit: P. Yang et. al.; via APS Physics; submitted by Kam-Yung Soh)

So much goes on in our daily lives that we never see. But with the power of the smartphones in our pockets, we can catch more than ever before, as illustrated in this video. (Image and video credit: M. Mungal)

Deep below the ocean surface, light is in short supply. But dive photographer Steven Kovacs specializes in capturing the ethereal creatures that live in this darkness. Many of his subjects are larval fish, whose forms defy our hydrodynamic expectations. (Image credit: S. Kovacs; via Colossal)

Avulsions -- sudden changes in the course of a river -- are a river's equivalent of an earthquake, and they can be similarly devastating for those in the river's path. (Image credit: top - R. Simmon/USGS, bottom - S. Brooke et al.; research credit: S. Brooke et al.; via AGU Eos; submitted by Kam-Yung Soh)

On 31 July 2022, an unusual tidal phenomenon, a fish-scale tide, took place on the Qiantang River's estuary in Zhejiang Province, China. I've not found any explanations for it thus far, so I'm assembling my own. (Image credit: VCG; submitted by Antony B.)

With 3D printing and other recent technologies, manufacturing options are always in flux. Here, researchers explore a method for printing a liquid inside of a liquid. (Image and research credit: P. Bazazi et al.)

Groundwater can sometimes wind up in unexpected places, given the way it interacts with subsurface structures. In this Practical Engineering video, Grady discusses the paths that groundwater takes around structures and how civil engineers account for groundwater-related forces on dams and other buildings. (Image and video credit: Practical Engineering)

Air and blue-dyed glycerin squeezed between two glass plates form curvy, finger-like protrusions. This is a close-up of the Saffman-Taylor instability, a pattern created when a less viscous fluid -- here, air -- is injected into a more viscous one. (Image credit: T. Pohlman et al.)

Thunderstorms over the ocean have substantially less lightning than a similar storm over land. Scientists wondered whether this difference could be due to lower cloud bases over the ocean or differences in the cloud droplets' nuclei. But a new study instead implicates coarse sea spray as the deciding factor. (Image credit: Z. Tasi; research credit: Z. Pan et al.)

Experimentalists often need a sense for the overall flow before they can decide where to measure in greater detail. For such situations, flow visualization techniques are a powerful tool since they provide quick ways to see and compare flows. (Image and video credit: V. Kumar et al.)

Pitcher plants often entice their insect victims with sweet nectar before trapping them in inescapable viscoelastic goo. But some species go even further. Nepenthes gracilis, a species native to Southeast Asia uses its leafy springboard to lure its prey. (Image credit: GFC Collection/Alamy; research credit: A. Lenz and U. Bauer; via New Scientist)

Brown reefs edge a turquoise lagoon in this astronaut snapshot of the New Caledonian coastline. Reefs like these form a natural barrier that protects coastlines from storms by breaking up waves (seen here as those white edges) before they reach the shore. (Image credit: NASA; via NASA Earth Observatory)

Photographer Lloyd Meudell captures breathtaking images of ocean waves off his home shores of New South Wales. (Image credit: L. Meudell; via Bored Panda)

Manmade soundproofing tends to be porous and bulky or very limited in the range of frequencies it can handle. In contrast, moths are natural absorbers of ultrasound, having evolved to avoid reflecting those frequencies back to the bats hunting them. (Image and research credit: T. Neil et al.; via Physics World)

When acoustically levitated, objects tend to clump together and move like a single, large solid. But researchers found more fluid-like states for their levitated particles when the particles were smaller. (Image and video credit: B. Wu et al.)

Assembling structures from small components is often difficult. Techniques like optical tweezers are limited to very small objects, and magnetic techniques only work with certain materials. Here, researchers use acoustical forces on bubbles to move and align centimeter-sized objects. (Image credit: top - J. Thomas, others - R. Goyal et al.; research credit: R. Goyal et al.; via APS Physics)

At first glance, today's video appears to have little to do with fluid dynamics since it's a demonstration of interactions between magnets. But for those who've delved into the mathematics of fluid dynamics -- especially subjects like perturbation theory -- there's a lot to appreciate here. (Image and video credit: Magnetic Tricks and Magnetic Games; via Colossal)

Snapshots of splashes are nothing new, but few have mastered the art of freezing incredible shapes in water the way Markus Reugels has. (Image credits: M. Reugels)

When we think of cavitation in a flow, we often think of it occurring at a relatively large scale -- on the propeller of a boat, for example. But cavitation takes place on microscales, too, including around fuel-injection nozzles. (Image and research credit: D. Podbevšek et al.; submitted by M. Dular)