The United Nations climate chief says phasing out all fossil fuels is central to curbing global warming

Turkish President Recep Tayyip Erdogan sealed an election victory in a runoff vote, raising the prospect of more

Ever wondered how optical illusions actually work? Wonder no more. A new study by University of Exeter visual ecologist Jolyon Troscianko, and neuroscientist Daniel Osorio from the University of Sussex in the UK has weighed in on the debate over whether we perceive things weirdly because of certain errors in the ways our brain processes colour, shade, and shape or because of our eye's function or the brain's neurological wiring. They reckon it is all in the eyes. The pair found ways our visual neurons – cells that process information coming in from the eyes – work, showing how they can affect our perception of patterns on different scales. "Our eyes send messages to the brain by making neurons fire faster or slower," said Troscianko. "However, there's a limit to how quickly they can fire, and previous research hasn't considered how the limit might affect the ways we see colour." Sign up to our free Indy100 weekly newsletter The new model suggests limits in processing and metabolic energy force neurons to compress visual data coming in through our eyes when looking at simple patterns. "Our model shows how neurons with such limited contrast bandwidth can combine their signals to allow us to see these enormous contrasts, but the information is compressed – resulting in visual illusions," said Troscianko. "The model shows how our neurons are precisely evolved to use every bit of capacity." Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

Ron Rivera's Washington Commanders produced another terrible first half and fell into a 24-point hole against the Chicago Bears

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President Joe Biden and House Speaker Kevin McCarthy have reached a tentative agreement to avert a catastrophic and unprecedented default on America’s sovereign debt, ending a monthlong standoff that threatened the US and global economies. The White House said Mr Biden and Mr McCarthy spoke by phone for roughly 90 minutes late Saturday. The president also spoke with Democratic congressional leaders as the talks between the White House and the Republicans who control the House of Representatives entered final stages after days of back-and-forth over GOP demands to add work requirements for food assistance and other programs meant to help lower-income Americans. One source familiar with the matter described the president and the House Speaker as having come to an “agreement in principle” that would limit federal spending while raising the nation’s statutory debt limit by an amount large enough to keep the issue off the table through the November 2024 general election. More follows...