Hidden structure is coming into view from inner-core hydrogen to quantum order and ancient tissue
A new superionic state has been flagged in iron hydride. A numerical model brings fracton signatures closer to solids, while soft tissue has been identified in a 450 million-year-old sea lily fossil.
Science··Morning
Under core-like conditions, hydrogen starts to flow
When a team at Institute of Science Tokyo compressed face-centered cubic iron hydride between 50 and 110 gigapascals and heated it above 2,000 kelvin, it saw a new threshold near 1,590 kelvin. At that point the iron atoms stay in place while hydrogen behaves more fluidly, so one part of the material keeps its solid order while another starts moving freely. The result gives the debate over hydrogen behavior near Earth's inner core a more concrete laboratory marker.[1]
A more realistic trace has appeared for quantum disorder
Improved Monte Carlo work on a two-dimensional spin-1 model by Helmholtz researchers found that the momentum-space distribution of spin correlations almost exactly matches the pattern predicted by gauge field theory. Direct observation of fractons remains a separate hurdle, but today's step shows they are no longer just an abstract theoretical game; they are becoming a target that solid-state setups can test. A hard-to-see quantum structure is therefore being moved a little closer to real materials.[2]
Ancient organisms can leave tissue behind in stone too
Researchers at the University of Oklahoma identified fossilized tube feet, the feeding structures, in a sea lily specimen of Dendrocrinus simcoensis that is 450 million years old. It is the second known crinoid with preserved soft tissue and the oldest example found so far. The fact that the fossil had been sitting in a museum collection in Montréal is also a reminder that supposedly invisible anatomical detail does not always arrive from a new dig; sometimes it appears when existing collections are read again with a sharper eye.[3]
