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The universe is humming with gravitational radiation—a very low-frequency rumble that rhythmically stretches and compresses spacetime and the matter embedded in it.
That is the conclusion of several groups of researchers from around the world who simultaneously published a slew of journal articles in June describing more than 15 years of observations of millisecond pulsars within our corner of the Milky Way galaxy. At least one group—the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration—has found compelling evidence that the precise rhythms of these pulsars are affected by the stretching and squeezing of spacetime by these long-wavelength gravitational waves.
“This is key evidence for gravitational waves at very low frequencies,” says Vanderbilt University’s Stephen Taylor, who co-led the search and is the current chair of the collaboration. “After years of work, NANOGrav is opening an entirely new window on the gravitational-wave universe.”
Julia Greer discusses her life background and research career in this five-part oral history.
Metals traditionally serve as the active materials for the negative electrodes in batteries. However, there’s been a shift towards using redox-active organic molecules like quinone-and amine-based compounds as negative electrodes in rechargeable metal–air batteries, which feature oxygen-reducing positive electrodes.
Here, protons and hydroxide ions participate in the redox reactions. Such batteries exhibit high performance, close to the maximum capacity that is theoretically possible. Furthermore, using redox-active organic molecules in rechargeable air batteries overcomes problems associated with metals, including the formation of structures called ‘dendrites,’ which impact battery performance, and have negative environmental impact.
Take a look at the ingredients in any jar of moisturizer and it’ll almost certainly contain hyaluronic acid.
The gel-like substance helps your skin stretch and flex, and reduces lines and wrinkles. It also helps wounds to heal faster and can reduce scarring.
But hyaluronic acid, also known as hyaluron, is costly to produce and raises ethical concerns because it’s largely derived from animal tissue.
Posted in futurism
The immense power of SpaceX’s Starship Super Heavy booster is on glorious display in newly released photos of a recent engine test.
That test occurred on Sunday (Aug. 6), when SpaceX briefly ignited the 33 Raptor engines of a Super Heavy prototype known as Booster 9 at the company’s Starbase site in South Texas.
The company aims to launch New Glenn, a huge rocket with a reusable booster, on its first flight next year.
“Frank Sinatra’s voice has been used on a version of the hip-hop song ”Gangsta’s Paradise,” while Johnny Cash’s has been deployed on the pop single ”Barbie Girl.” A YouTube user called PluggingAI offers songs imitating the voices of the deceased rappers Tupac and Notorious B.I.G.
”An artist’s voice is often the most valuable part of their livelihood and public persona, and to steal it, no matter the means, is wrong,” Universal Music general counsel Jeffrey Harleston told US lawmakers last month.
Discussions between Google and Universal Music are at an early stage, and no product launch is imminent, but the goal is to develop a tool for fans to create these tracks legitimately, and pay the owners of the copyrights for it, said people close to the situation. Artists would have the choice to opt in, the people said.
The discussions, confirmed by four people familiar with the matter, aim to strike a partnership for an industry that is grappling with the implications of new AI technology.
SpaceX next-generation Starship rocket took a major step forward on August 6, when it conducted a successful static fire test. The test involved firing all 33 Raptor engines on the Booster 9 prototype, which is the first stage of the Starship rocket.
