In a major breakthrough, scientists have created time crystals which continuously and repeatedly change their state over time, without either absorbing or dissipating any energy, thus becoming true perpetual motion machines.
Researchers have discovered one of the oldest and best-preserved brains in the fossil record. A 310-million-year-old horseshoe crab was found with its complete brain intact, thanks to a previously unknown preservation method.
The majority of our knowledge of ancient creatures comes from bones – soft tissues don’t fossilize very well. Some mechanisms are better than others at preserving these fragile tissues though, most famously amber. Scientists can then scan amber-encased creatures to image their brains and other organs.
But that record only goes back so far. The oldest amber inclusions date back about 230 million years ago, to the Triassic period. Burgess Shale-type deposits, however, extend as far back as 520 million years ago, to the early Cambrian. These mudstone deposits can also preserve soft tissues as carbon films – most commonly the gut, but on rare occasions imprints of parts of the nervous system can be found.
Upon an otherwise unruly landscape of choppy sea and craggy peaks, the salmon farms that dot many of Norway’s remote fjords impose a neat geometry. The circular pens are placid on the surface, but hold thousands of churning fish, separated by only a net from their wild counterparts. And that is precisely the conundrum. Although the pens help ensure the salmon’s welfare by mimicking the fish’s natural habitat, they also sometimes allow fish to escape, a problem for both the farm and the environment.
In an attempt to prevent escaped fish from interbreeding with their wild counterparts and threatening the latter’s genetic diversity, molecular biologist Anna Wargelius and her team at the Institute of Marine Research in Norway have spent years working on ways to induce sterility in Atlantic salmon. Farmed salmon that cannot reproduce, after all, pose no threat to the gene pool of wild stocks, and Wargelius has successfully developed a technique that uses the gene-editing technology Crispr to prevent the development of the cells that would otherwise generate functioning sex organs.
In fact, Wargelius’ team was a little too successful. To be financially viable, commercial fish farms need at least some of their stock to reproduce. So the scientists went a step further, developing a method of temporarily reversing the modification they had already made. They’ve created what they call “sterile parents.”
The space-faring firm’s satellite internet service promises connections with high speed and low latency — and data suggests the rollout pace is now increasing.
Like a perpetual motion machine, a time crystal forever cycles between states without consuming energy. Physicists claim to have built this new phase of matter inside a quantum computer.
As a cardiac electrophysiologist, Deeptankar DeMazumder has worked for years with people at risk for sudden cardiac arrest (SCA). Despite the latest medical advances, less than 10 percent of individuals stricken with an SCA will survive this highly dangerous condition in which irregular heart rhythms, or arrhythmias, cause the heart suddenly to stop beating.
In his role as a physician, DeMazumder keeps a tight focus on the electrical activity in their hearts, doing his best to prevent this potentially fatal event. In his other role, as a scientist at the University of Cincinnati College of Medicine, DeMazumber is also driven by a life-saving aspiration: finding ways to identify at-risk individuals with much greater accuracy than currently possible—and to develop better ways of protecting them from SCAs. He recently received a 2020 NIH Director’s New Innovator Award to pursue one of his promising ideas.
SCAs happen without warning and can cause death within minutes. Poor heart function and abnormal heart rhythms are important risk factors, but it’s not possible today to predict reliably who will have an SCA. However, doctors already routinely capture a wealth of information in electrical signals from the heart using electrocardiograms (ECGs). They also frequently use electroencephalograms (EEGs) to capture electrical activity in the brain.
Scientists from Cambridge University and NTU Singapore have found that slow-motion collisions of tectonic plates drag more carbon into Earth’s interior than previously thought.
They found that the carbon drawn into Earth’s interior at subduction zones — where tectonic plates collide and dive into Earth’s interior — tends to stay locked away at depth, rather than resurfacing in the form of volcanic emissions.
What’s the weather like at night on Venus? Scientists are finally finding out.
Just one planet away, Venus is relatively close to Earth and we have been studying it for a long time, with the first Venusian probe reaching the planet in 1978. However, scientists have known very little about what the weather is like at night on Venus. That is, until now.
New influenza virus vaccines tested in humans elicit broadly cross-reactive antibodies that bind the stalk of the viral hemagglutinin protein and may serve as templates to design a universal influenza vaccine.
The mosquito-borne Zika virus is an emerging pathogen from the Flavivirus genus for which there are no approved antivirals or vaccines. Using the clinically validated PDK-53 dengue virus vaccine strain as a backbone, we created a chimeric dengue/Zika virus, VacDZ, as a live attenuated vaccine candidate against Zika virus. VacDZ demonstrates key markers of attenuation: small plaque phenotype, temperature sensitivity, attenuation of neurovirulence in suckling mice, and attenuation of pathogenicity in interferon deficient adult AG129 mice. VacDZ may be administered as a traditional live virus vaccine, or as a DNA-launched vaccine that produces live VacDZ in vivo after delivery. Both vaccine formulations induce a protective immune response against Zika virus in AG129 mice, which includes neutralising antibodies and a strong Th1 response.