A new study reveals that the adult human brain continues to produce new neurons throughout life, a process that is highly active in older individuals with exceptional memories but severely limited in those with Alzheimer’s disease.

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Since the 1960s, global GDP has been rapidly rising and living standards have reached record highs. But something else has been rocketing up too – carbon emissions. For years, scientists and economists have been asking: is it possible to grow without heating and polluting the Earth? And as the climate becomes more unstable, the issue is only becoming more urgent. Madeleine Finlay hears from two economists arguing for a change in how we measure a country’s success. Nick Stern is professor of economics and government at the London School of Economics and an advocate of green growth, an approach to growth that prioritises green industry. Jason Hickel is a political economist and professor at the Autonomous University of Barcelona who advocates degrowth, shrinking parts of the economy that do not advance our social and ecological goals.

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Previously, he also raised the possibility of invoking the Defense Production Act to force Anthropic to hand over an unrestricted version of Claude on national security grounds.

If Anthropic doesn't relent, experts say its best bet would be legal action. But will the Pentagon's proposed penalties be enough to scare a profit-driven startup into compliance? Hegseths' threats reportedly include invoking the Defense Production Act, which gives the president authority to direct private companies prioritize certain contracts in the name of national defense. The military could also sever its contract with Anthropic and designate it as a supply chain risk. That would force other companies working with the Pentagon to certify that Claude isn't included in their workflows.

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