In this issue: Origins of refractory organic solids in protoplanetary disks, early evidence of pig domestication in South China, and how sleep deficiency worsens gum disease. In PNAS:

Data from the GRACE and GRACE-FO satellite missions provide a record of barystatic sea level since 1993. The rate of barystatic sea level change—the change in the mass of the ocean—speeds up after 2003, due to accelerated ice loss in Greenland. In PNAS:

One of the most-viewed PNAS articles in the last week is “Increased frequency of planetary wave resonance events over the past half-century” Explore the article here: For more trending articles, visit

Island species are often more susceptible to extinction than their mainland counterparts, but mammals endemic to the Wallacea archipelago—the anoa and babirusa—are genetically healthier on islands than on the mainland of Sulawesi. In PNAS:

New #sensor technology expands the ability to track #neurochemicals. In PNAS Journal Club: #dopamine #NeuralNetwork #schizophrenia #depression #CyclicAMP #DyeCaptureProtein

In this issue: A symbiosis between sea spiders and methanotrophic bacteria, how winters limit butterfly range expansion, and evidence of episodic marine anoxic events during a glacial period. In PNAS:

Sea spiders at deep-sea methane seeps farm bacteria on their exoskeletons—and feed on them. This newly discovered symbiosis reveals a novel way methane enters the deep-sea food web. In @Smithsonian: . In PNAS:

China’s Qinghai-Tibet Plateau is known for its unique species, found nowhere else. A study explores how geoclimatic changes during the Cenozoic Era, including uplift of the plateau and climate change, created a unique biodiversity hotspot. In PNAS:

A trending PNAS article in the last week is “Methane-powered sea spiders: Diverse, epibiotic methanotrophs serve as a source of nutrition for deep-sea methane seep Sericosura.” Read more: For more trending articles, visit

A stifling #HeatDome is hovering over the United States. What could this signal for global conditions in the years ahead? Explore interactive maps to see where dangerous #WetBulb temperatures, #drought, and #floods are projected to strike. In PNAS:

What can Martian rocks tell us about the history of water? In the latest Science Sessions episode, researchers discuss what returned samples could reveal about Mars’s climate, chemistry, and habitability. 🎧 Same trusted science now with a new sound:

Researchers created baby mice from two sperm injected into an enucleated egg. The androgenetic mice, which were produced with the help of CRISPR-based epigenome engineering, lived to adulthood and were fertile. In PNAS:

Honoring Floyd E. Bloom (1936–2025), a pioneering neuroscientist and visionary leader who helped shape modern neuroscience. His legacy spans groundbreaking research, journal leadership, and mentorship. Read the PNAS Retrospective:

Nearly half of California’s wild winter-run Central Valley Chinook salmon died from vitamin deficiency in 2020–2021, due to the dominance of anchovies in their diet. Anchovies did not provide enough thiamine to keep the salmon healthy. In PNAS:

A study explores the climates that 32,089 tree species may experience by the end of the century. Some 69% of species will experience macroclimatic shifts in at least 10% of their range. Climate refugia will help many species persist. In PNAS:

Read highlights in this week’s issue of PNAS: The evolution of northern European mammals, interactions between predators and Antarctic fishing operations, and new insights into the origins of Oldowan stone tools. In PNAS:

Opinion piece: Written #forensic case reports should be required #legal and #scientific documents. Without them, standards drop, accountability suffers, and miscarriages of #justice occur. In PNAS Front Matter: #ForensicScience #ForensicScientists #crime

A battery made of vitamin B2? Researchers created an organic, electroactive polymer material for use as a battery anode. Multiple copies of vitamin B2 were incorporated into the backbone to act as redox-active units, enabling energy storage. In PNAS:

One of the most-viewed PNAS articles in the last week is “Antioxidants prevent health-promoting effects of physical exercise in humans.” Explore the article here: For more trending articles, visit

A quarter of Earth and more than 50% of its population are affected by water scarcity each year. Considering only surface and groundwater can underestimate the problem, as insufficient soil moisture and water quality are also key factors. In PNAS:

#Hubble, #JWST, and other #telescopes are teaming up to probe distant #exoplanets and assess their potential conditions to support #life. A PNAS Inner Workings article: #HubbleTelescope #exoplanet #HabitableWorldsObservatory #astronomy