🔬 Actualités Science aux États-Unis

• Google engineers developed TurboQuant, a method compressing AI data to require up to six times less working memory without performance loss. • The system enables AI algorithms to retain information and compute powerfully with reduced hardware needs. • This breakthrough lowers barriers for deploying advanced chatbots and AI models on resource-constrained devices.

• An international team including University of Wisconsin–Madison researchers measured the force of particle jets blasted from a black hole in the Cygnus system. • This first-of-its-kind measurement confirms a prediction made by UW-Madison astronomers a decade ago. • The findings validate long-standing theories on black hole jet mechanics, advancing astrophysics understanding.

• On April 14, 2026, the Dark Energy Spectroscopic Instrument (DESI) completed its primary mission early, creating the largest-ever 3D map of 47 million galaxies. • The dataset represents a sixfold increase over all previous galactic measurements, enabling new analysis of the universe's shape and size. • This breakthrough could reconcile quantum physics and general relativity toward a theory of everything, positioning US National Laboratories to lead global science.

• Scientists achieved the first teleportation of a photon's state between two separate quantum dots over a 270-meter open-air link. • The experiment used GPS synchronization, ultra-fast detectors, and turbulence stabilization, reaching 82% state fidelity exceeding classical limits by over 10 standard deviations. • Published in Nature Communications, this milestone advances quantum internet for ultra-secure communication and quantum relays.

• The US life sciences industry gained momentum in 2026 despite NIH cuts and trade threats, fueled by AI advancements and major pharma deals. • Karius's AI genomic tests for immunocompromised patients detect 50% more pathogens in one day, analyzing millions of DNA reads after testing over 100,000 cases. • Biotech winter ended, shifting focus to preventive health via AI, data, and precise therapeutics amid administration priorities.

• MIT researchers discovered that chaotic laser light can self-organize into a highly focused 'pencil beam' under precise conditions, enabling rapid 3D imaging of the blood-brain barrier. • The new method images at speeds 25 times faster than current techniques and tracks drug movement into brain cells in real time. • This breakthrough could accelerate treatments for neurological diseases by allowing high-precision observation of protein absorption in cells.

• Researchers introduced GAME, a suite of AI algorithms that improve accuracy in tracking cosmic changes by 95% for derivatives and 20% overall. • Published on arXiv in February, GAME enhances astrophysical modeling of the universe's dynamic behavior. • The technique sharpens AI's ability to reconstruct test functions, revealing potential flaws in current cosmological understanding.

• SRI International contributed to four of the top 15 greatest US breakthroughs as ranked by Wall Street Journal readers: the internet, personal computing, color television, and artificial intelligence. • The recognition highlights SRI's foundational role in transformative technologies. • This acknowledgment underscores US leadership in science and innovation history.

• Scientists using the Rubin Observatory identified over 11,000 new asteroids in our solar system. • Discoveries include hundreds of distant objects beyond Neptune, expanding knowledge of outer solar system. • This US-based telescope project enhances planetary defense and solar system mapping efforts.

• An international team including University of Oxford, University of Michigan, and others used the Gemini laser and plasma to compress light, creating the most powerful light ever in a lab. • The technique acts as a 'quantum magnifying glass' by focusing light waves, enabling direct study of Quantum Electrodynamics (QED) interactions with the quantum vacuum. • Published in Nature on April 22, 2026, it bridges a 20-year gap between theory and observation, per Prof. Brendan Romey of Queen's University Belfast.

• Researchers at CERN's Large Hadron Collider detected rare Higgs boson decay patterns that deviate from Standard Model predictions, suggesting potential physics beyond current theoretical frameworks. • The analysis examined 150 billion particle collisions collected over two years, revealing a 3.2 sigma deviation in the boson's decay pathways, announced on April 20 by the ATLAS and CMS collaborations. • The findings could indicate undiscovered particles or fundamental forces and represent significant progress toward understanding the universe's most elusive particles.

• Researchers from Woods Hole Oceanographic Institution reported that Atlantic cod and other commercial fish populations have rebounded 34% over the past four years following strict catch quotas and marine protected areas implemented in 2022. • Population surveys conducted across 850,000 square kilometers of Atlantic waters show biomass increases in previously depleted stocks, with detailed findings presented at the American Fisheries Society conference on April 19. • The recovery demonstrates that science-based fisheries management can restore ecosystems within a decade, providing a model for international ocean conservation efforts.

• Researchers at the University of Washington created an artificial photosynthesis prototype converting sunlight directly into storable chemical fuels with 13% efficiency, surpassing previous laboratory records of 8-10%. • The system uses engineered nanostructures and novel catalysts to split water and fix carbon dioxide, producing methanol as a liquid fuel suitable for existing energy infrastructure, detailed in Nature Energy on April 21. • The breakthrough could enable large-scale production of carbon-neutral synthetic fuels without competing for agricultural land, addressing both climate and energy security challenges.

• The FDA granted accelerated approval to a CRISPR-based gene therapy for severe sickle cell disease on April 20, marking the first approved genetic treatment editing patient blood cells to produce functional hemoglobin. • Clinical trials demonstrated 95% of treated patients experienced elimination or near-elimination of vaso-occlusive crises within 12 months, with durable responses observed for over two years post-treatment. • The therapy addresses a disease affecting approximately 100,000 Americans, primarily of African descent, offering potential cure for patients previously reliant on pain management and blood transfusions.

• The US Geological Survey documented unusual seismic activity patterns beneath Yellowstone National Park over the past 72 hours, including 127 small earthquakes concentrated in a previously stable subsurface region. • Monitoring stations recorded magnitude 2.0-3.8 events with distinct directional propagation, suggesting possible magma chamber adjustments rather than typical tectonic shifts, announced April 21 by USGS geophysicists. • Scientists emphasize current volcanic threat levels remain low based on gas emissions and ground deformation data, though real-time monitoring has been intensified as a precautionary measure.

• Stanford University neuroscientists discovered a blood-based biomarker (phosphorylated tau-217) that reliably predicts Alzheimer's disease development one to two decades before cognitive decline appears, according to research published April 20. • The biomarker was identified through analysis of blood samples from 2,500 cognitively healthy individuals followed for 15 years, with positive predictive value exceeding 92% in early-stage detection. • The finding could enable preventative therapies targeting amyloid and tau proteins before neurodegeneration becomes irreversible, potentially transforming Alzheimer's treatment approaches.

• NASA's Perseverance rover discovered extensive water ice deposits beneath Mars' surface in Jezero Crater using advanced ground-penetrating radar technology, with findings suggesting accessibility for future human missions. • The subsurface ice layers extend up to 300 meters deep and contain an estimated 5 million metric tons of water ice, according to data released by NASA's Jet Propulsion Laboratory on April 21. • Scientists believe the water deposits could support long-term human habitation and fuel production, making Mars exploration more feasible for sustained presence beyond current rover missions.

• A comprehensive analysis from the National Center for Atmospheric Research shows US carbon dioxide emissions fell 8.2% year-over-year in Q1 2026, driven primarily by renewable energy sources now supplying 34% of national electricity generation. • Solar and wind capacity additions reached record levels with 42 gigawatts of new renewable infrastructure installed in 2025, according to data released by the Department of Energy and independent research institutions. • Climate scientists attribute the acceleration partly to state-level climate policies and federal incentives from the 2024 Clean Energy Investment Act, though transportation and industrial sectors still require significant emission reductions.