By comparing new Hubble observations with images first taken in 1999, astronomers traced the continuing expansion of one of the sky’s most studied supernova remnants, energized by a rapidly spinning pulsar at its core. This image, captured with the NASA/ESA Hubble Space Telescope in 2024, shows the Crab Nebula. Image credit: NASA / ESA / STScI / William Blair, JHU / Joseph DePasquale, STScI. In...

Samples returned by JAXA’s Hayabusa-2 mission from the C-type asteroid (162173) Ryugu contain all five canonical nucleobases — purines (adenine and guanine) and pyrimidines (cytosine, thymine and uracil) — pointing to a cosmic origin for some of life’s fundamental chemistry. Hayabusa-2 image of the asteroid Ryugu as seen from a distance of 3.7 miles. A particularly large crater is...

Examining 31 ancient societies across Europe, Asia, and the Americas, researchers found that democratic systems were more widespread than once believed — and not determined by population size or geography. The Acropolis at Athens by Leo von Klenze. The word ‘democracy’ was, of course, invented by the Greeks — demokratia meant simply that people (demos) had power (kratos). This definition...

Known from a single skull discovered in South Africa in 1952, Cistecynodon parvus has been shuffled across the evolutionary tree: described at various times as a close relative of advanced cynodonts, a juvenile of another species and even something outside the group altogether. Now, a new study using computed tomography (CT) scans to digitally reconstruct the fossil concludes that this Triassic creature...

A team of researchers from the United States and Germany has identified fungal proteins that can freeze water at relatively warm subzero temperatures, raising the prospect of safer cloud seeding, improved climate models and new advances in food preservation and medicine. Mortierellomycetes and Umbelopsidomycetes fungi from freshwater ecosystems in Korea. Image credit: Goh et al., doi: 10.4489/kjm.20230018. In...

Physicists from the LHCb experiment at CERN’s Large Hadron Collider (LHC) have discovered a new kind of heavy proton-like particle. Known as Ξcc⁺, this particle contains two charm quarks and one down quark, giving scientists a rare new way to probe the strong force that binds the building blocks of matter. An artist’s impression of the doubly charmed baryon Ξcc⁺, which contains two charm...

New experiments show that tar made from birch bark — long known as a tool adhesive — can inhibit harmful bacteria such as Staphylococcus aureus, suggesting Neanderthals may have used it to treat wounds and manage infection during the Ice Age. Neanderthals probably used birch tar for multiple functions, including treating their wounds. Siemssen et al. confirm that birch tar possesses selective...

In a randomized clinical trial of older adults, researchers found that taking multivitamins for two years modestly slowed epigenetic markers of aging — equivalent to roughly four months less biological aging compared with a placebo. Li et al. evaluated the two-year effect of daily multivitamin-multimineral supplements and cocoa extract (500 mg cocoa flavanols per day, including 80 mg epicatechin)...

By tracing magnetic signals preserved in 3.5-billion-year-old rocks in Western Australia, geoscientists have found the oldest direct evidence yet that parts of the planet’s outer shell were shifting across the globe, pushing the origins of plate motion deep into Earth’s early history. Hadean Earth. Image credit: Alec Brenner. “There has been a huge range of ages suggested for timing,” said...

By tracing magnetic signals preserved in 3.5-billion-year-old rocks in Western Australia, geoscientists have found the oldest direct evidence yet that parts of the planet’s outer shell were shifting across the globe, pushing the origins of plate motion deep into Earth’s early history. Hadean Earth. Image credit: Alec Brenner. “There has been a huge range of ages suggested for timing,” said...