'Sharkansas' contains entire fossilized skeletons dating back 320 million years. Breakthroughs, discoveries, and DIY tips sent six days a week. Arkansas is hundreds of miles from the Gulf of Mexico, but it's home to countless sharks . A trove of the fossilized predator's remains are embedded within the Fayetteville Shale --a roughly 350-million-year-old geological formation in the state's northwestern corner. Because a shark's cartilage skeleton decomposes so quickly, they usually only leave teeth behind when they die.

Noisy ships and industry are impacting critically endangered Kemp's ridley sea turtles. Breakthroughs, discoveries, and DIY tips sent six days a week. For the world's smallest sea turtles, life in the ocean is getting pretty noisy. These relatively little turtles (on average they're still 75 to 100 pounds) mostly found in the Gulf of Mexico already face fishing gear accidents, seacraft collisions, plastic pollution, and habitat deterioration, and now excess noise may be harming the critically endangered and rare Kemp's ridley sea turtles (). We say because even though these sea turtles share waters with extremely busy shipping lanes, scientists know very little about their underwater hearing.

Inverse problems describe the task of recovering an underlying signal of interest given observables. Typically, the observables are related via some non-linear forward model applied to the underlying unknown signal. Inverting the non-linear forward model can be computationally expensive, as it often involves computing and inverting a linearization at a series of estimates. Rather than inverting the physics-based model, we instead train a surrogate forward model (emulator) and leverage modern auto-grad libraries to solve for the input within a classical optimization framework. Current methods to train emulators are done in a black box supervised machine learning fashion and fail to take advantage of any existing knowledge of the forward model. In this article, we propose a simple learned weighted average model that embeds linearizations of the forward model around various reference points into the model itself, explicitly incorporating known physics. Grounding the learned model with physics based linearizations improves the forward modeling accuracy and provides richer physics based gradient information during the inversion process leading to more accurate signal recovery. We demonstrate the efficacy on an ocean acoustic tomography (OAT) example that aims to recover ocean sound speed profile (SSP) variations from acoustic observations (e.g.

Do trees really explode in extreme cold? The answer involves frozen sap, the polar vortex, and a lot of internet exaggeration. Heavy snow fall, not explosions, are far more threatening to trees and yourself. Breakthroughs, discoveries, and DIY tips sent six days a week. The majority of the United States is bracing itself for a potentially historic polar vortex winter storm this weekend .

What We Know About the Winter Storm About to Hit the US--and What We Don't A huge portion of the United States is going to be hit with snow or freezing rain this weekend. Exactly where, what, and how much remains uncertain. Over the past weekend, when weather models first started forecasting a winter storm that would sweep over large parts of the country, Sean Sublette, a meteorologist living in Virginia, started telling people in his area to prepare for snow . At the time, Sublette says, "a lot of the data started to point to a substantial snow storm for the mid-Atlantic and the Northeast, with significant ice farther southward into Carolina's Tennessee Valley." Then, Sublette woke up Wednesday morning.

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This was supposed to be the year when autonomous agents took over everyday tasks. One year ago, Sam Altman, the C.E.O. of OpenAI, made a bold prediction: "We believe that, in 2025, we may see the first AI agents'join the workforce' and materially change the output of companies." A couple of weeks later, the company's chief product officer, Kevin Weil, said at the World Economic Forum conference at Davos in January, "I think 2025 is the year that we go from ChatGPT being this super smart thing . . . to ChatGPT doing things in the real world for you." He gave examples of artificial intelligence filling out online forms and booking restaurant reservations. He later promised, "We're going to be able to do that, no question."

Tech companies may have lost their moral standing, but at least they added shareholder value. Elon Musk holds up a chainsaw onstage during the Conservative Political Action Conference (CPAC) in National Harbor, Maryland, U.S., February 20, 2025. Sure, we've seen millions poured into lobbying and other means of influence during every presidency, but the last two years set a whole new bar. Business leaders, including those from almost every Big Tech company, stepped over themselves to prove fealty to Donald Trump's second administration. It's easy to see why: Their kowtowing was meant to secure regulatory favors, gain tax and tariff advantages and avoid Trump's ire.

Science Biology Without dinosaurs, there'd be no Thanksgiving dinner The evolution of today's beloved side dishes took off 66 million years ago. Breakthroughs, discoveries, and DIY tips sent every weekday. It's hard to pick a favorite dish on your Thanksgiving plate. But regardless of your selection, there's a decent chance its history can be traced back to one of the most cataclysmic events in Earth's history. "The dinosaurs' absence meant changes in the forest structure-you went from a more open canopy to a more-closed canopy rainforest," explained Mike Donovan, a paleobotanist and the fossil plants collections manager at Chicago's Field Museum .