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OpenAI CEO Sam Altman says GPT-5 is PhD-level general intelligence. Aflo Co Ltd/Alamy

GPT‑5: has AI just plateaued?

GPT-5’s focus on routing queries to the best model could be an admission that LLMs can’t get much smarter.
Wandering magnetic fields would have had noticeable effects for humans. Maximilian Schanner (GFZ Helmholtz Centre for Geosciences, Potsdam, Germany)

Weird space weather seems to have influenced human behavior on Earth 41,000 years ago – our unusual scientific collaboration explores how

Two geophysicists and an archaeologist teamed up to connect space weather 41,000 years ago to human behaviors that might have been in response – and show the value in cross-discipline teamwork.
Chinese tourists at Everest’s northern base camp, Rongbuk in Tibet, photograph the world’s highest mountain. Carl Cater

China’s Everest obsession: following Mallory’s footsteps a century on, I saw how tourism and climate change are transforming the mountain

A century after the disappearance of explorer George Mallory, his photos and diary offer a valuable baseline for investigating impacts of tourism and climate change on the Tibet side of Everest.
A cnidarian is attached to a dead sponge stalk on a manganese nodule in the Clarion-Clipperton Zone. Diva Amon and Craig Smith, University of Hawaii at Mānoa

Deep‑sea mining threatens sea life in a way no one is thinking about, and Trump’s order could clear the way for operations soon

Companies are preparing to move forward with seabed mining, but a method for gathering critical minerals from the seafloor would create sediment plumes in the water column where many creatures live.
Synthetic biology offers many tantalizing possibilities, but scientists consider some projects too risky to pursue. DBenitostock/Moment via Getty Images

Mirror life is a scientific fantasy leading to a dangerous reality − a synthetic biologist explains how mirror bacteria could conquer life on Earth

Synthetic cells that look just like natural cells but are chemically reversed could outcompete other living organisms − with dire consequences for human health and the environment.

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