Neanderthals traveled at least two evolutionary paths on their way to extinction around 40,000 years ago, a new study suggests. If it is classified as a separate species or a variant of Homo sapiensNeanderthals have usually been seen as a genetically stable population. But the partial skeleton of an adult male discovered in France contains … Ler mais
When strained by earthquakes, underground networks of quartz veins can generate enough tension to leach gold from passing fluids, researchers report Sept. 2 in Nature Geoscience. The findings explain how fluids carrying small amounts of gold can fabricate large pieces, even in chemically inert environments. “You find a quartz vein 2 meters wide, and there’s … Ler mais
citations J. O’Conner et al. Effect of ashwagandha on stress, sleep quality, and food cravings in college students: quantitative analysis of a double-blind randomized control trial. Journal of Medicinal Food. Vol. December 25, 2022, p. 1086. doi: 10.1089/jmf.2022.0040. C. Baker et al. Perceived impact of ashwagandha on stress, sleep quality, energy, and mental clarity in … Ler mais
Extreme Climate Survey Scientific news is collecting readers’ questions about how to navigate our planet’s changing climate. What do you want to know about extreme heat and how it can lead to extreme weather events? Most “radiant cooling” designs involve roofs designed to receive and then emit the sun’s energy in infrared wavelengths that radiate … Ler mais
African rock art depicting a mythical tufted creature may reflect the appearance of fossilized real-life relatives of ancient mammals called dicynodonts. Abundant fossils exposed in South Africa’s Karoo Basin include dicynodont skulls with tusks that bend down and back, like those of the long-bodied animal depicted in roughly 200-year-old rock art by the region’s San … Ler mais
A distant stellar nursery holds a cluster of newborn worlds the size of Jupiter, the smallest of which is surrounded by a disk of dust that may one day form moons. The detailed discovery, made thanks to the unprecedented sensitivity of the James Webb Space Telescope, could provide new insights into the formation of stars … Ler mais
The motion of moving electrons is captured like never before. Researchers have developed a laser-based microscope that produces images at speeds of attoseconds – or one billionth of one billionth of a second. Called “attomicroscopy,” the technique can capture the sharp movement of electrons inside a molecule with far greater precision than was previously possible, … Ler mais
A lucky alignment of two sun-studying spacecraft may have finally solved a decades-old solar mystery. Data from NASA’s Parker Solar Probe and the European Space Agency’s Solar Orbiter suggest that plasma waves known as Alfvén waves inject energy into the solar wind as it leaves the sun’s outer atmosphere, potentially explaining why the solar wind … Ler mais
Scientists have just narrowed down the possible hiding spaces for dark matter particles. The LUX-ZEPLIN, or LZ, experiment has searched for and ruled out the existence of dark matter particles with a wide range of properties, researchers report Aug. 26 at two conferences. Dark matter is a substance whose influence can be seen on the … Ler mais
Among the more than 500 species of bacteria that thrive in the human mouth, one seems to play by its own rules. Instead of reproducing by dividing into two, as most bacteria do, Corynebacterium matruchotii divides into 14 cells simultaneously, researchers report on Sept. 10. Proceedings of the National Academy of Sciences. This video shows … Ler mais