The capacitive technology that allows us to physically interact with touchscreens isn’t just limited to our fingers or a fancy stylus. Hopefully, someone somewhere is polishing up a Nobel Prize because a researcher discovered that pastries work with touchscreens too, and with some clever baking techniques, an iPad is…
A Pringle is a hyperbolic paraboloid. Mel Magazine invited several mathematicians to analyze the delicious geometry of the chip. From Mel:
Theron Hitchman, Professor of Mathematics at the University of Northern Iowa: Usually, the way mathematicians talk about this kind of thing is in an equation, but I think equations tend to scare people off, so, I guess you could say that a hyperbolic paraboloid is a kind of surface that, when cut one way, it looks like parabolas opening down, and if you rotate it 90 degrees, it looks like parabolas opening up[…]
[Software engineer and mathematician Varun] Vachhar: Hyperbolic paraboloids are really interesting.
Enlarge/ Foods will sometimes get stuck to a heated surface, even if oil or a nonstick frying pan is used. Scientists have concluded that convection may be to blame. (credit: Dan Tentler/via Getty Images)
Home cooks around the world have relied on nonstick cookware for decades for quick and easy cleanup after preparing meals. But sometimes food will get stuck to the center of nonstick pans anyway. A new paper published in the journal Physics of Fluids offers a likely explanation—food sticks because of the same underlying mechanism that gives rise to the coffee ring effect and so-called “wine tears.”
The first nonstick frying pans were made possible by the invention of Teflon in 1938 by a chemist named Roy Plunkett, who was researching possible new chlorofluorocarbon refrigerants as part of a joint venture with DuPont. In April of that year, Plunkett later recalled, his assistant selected one of the cylinders they were using to store tetrafluoroethylene gas (TFE) at dry-ice temperatures until the canisters were ready to be chlorinated for their experiments. When the assistant opened the valve, the gas did not flow under its own pressure from the container, as expected.
Puzzled, the researchers opened the container only to find the gas was gone. In its stead, they found a white powder. The TFE had polymerized into a waxy solid called polytetrafluoroethylene (PTFE), which proved to have some interesting properties: it was chemically inert and heat-resistant, and it had very low surface friction. Perhaps it wasn’t useful as a refrigerant, but it proved to be a terrific nonstick coating.
Yelp recently introduced a COVID-19 section on its app, allowing businesses to detail the sanitary measures they’ve taken to protect clients. Now, the review site is allowing customers to provide feedback on those practices. You can report if staff a…
One goal of AI researchers is to figure out how to make machine learning models more interpretable so researchers can understand why they make their predictions. Google says this is an improvement from taking the predictions of a deep neural network at face value without understanding what contributed to the model output. Researchers have shown how to build an explainable … Continue reading
It’s been one week since astronauts Robert Behnken and Douglas Hurley made history by successfully riding SpaceX’s Falcon 9 rocket up to the International Space Station. This calls for a celebration! And what orbital party would be complete without t…