Free Republic

After a long day at work, the modern goldfish no longer has to take public transportation home—it can drive via a fish-operated vehicle (FOV), according to new research published in Behavioural Brain Research. Documented in a report published in the February 2022 issue of the peer-reviewed journal, researchers at Ben-Gurion University of the Negev in Beersheba, Israel, set out to unpack how well goldfish can navigate terrestrial environments when tasked with the right tools. They created a small camera-equipped fish tank on wheels, which they call an FOV, and put six goldfish in it, one at a time. Over a...

Water is the most abundant yet least understood liquid in nature. It exhibits many strange behaviors that scientists still struggle to explain. While most liquids get denser as they get colder, water is most dense at 39 degrees Fahrenheit, just above its freezing point. This is why ice floats to the top of a drinking glass and lakes freeze from the surface down, allowing marine life to survive cold winters. Water also has an unusually high surface tension, allowing insects to walk on its surface, and a large capacity to store heat, keeping ocean temperatures stable.Now, a team that includes...

US researchers have used ferrofluids as liquid pistons that could be used to make adjustable liquid lenses with nearly perfect spherical interfaces for applications such as an optometrist's phoropter. A phoropter measures the way light is focused in the eye and is used to determine prescriptions for glasses and contact lenses. Ferrofluids are colloidal solutions of ferromagnetic nanoparticles suspended in a dispersing liquid. Ferrofluid droplets can be manipulated by a magnetic field, so they could be used in systems that need precise control, such as optics, drug delivery, and electronic devices. Amir Hirsa and colleagues from Rensselaer Polytechnic Institute in Troy, New...

Grazing the Nanograss - Adaptable substance may cool computers and put a zoom lens in your cell phone. Future Watch by Gary H. Anthes OCTOBER 11, 2004 (COMPUTERWORLD) - A drop of water glides across the flat surface like quicksilver, moving effortlessly from place to place as the surface is tilted. It's hard to believe that the little bead is water, for it doesn't wet the surface as it races around, seemingly without friction. The little drop in this impromptu laboratory demonstration isn't on an ordinary surface. It's riding on "nanograss," a bed of upright silicon posts a thousand times...