Ann Widdecombe murder investigation taken over by counter-terror police – The Latest

Sixteen- and 17-year-olds face an overnight social media curfew in an extension of the government’s social media ban for under-16s. Under the plan, aimed at reducing online harms, certain apps would be blocked by default from midnight to 6am. But the curfew will not be mandatory and teenagers can opt out, so will it achieve anything? Annie Kelly speaks to social affairs correspondent Jessica Murray – watch on YouTube. Help support our independent journalism at theguardian.com/infocus

When Mark Lanier and his young client Kaley faced Meta and Google in an LA courtroom earlier this year, it seemed a bigger battle than David v Goliath. Lanier, however, was determined to prove the companies had not just stumbled into a youth mental health crisis, but had helped to engineer it. Help support our independent journalism at theguardian.com/infocus

The US government has been forced to pay billions in refunds to companies that were hit by Donald Trump’s ‘liberation day’ tariffs. The US has paid out $81bn (£61bn) this fiscal year after the supreme court ruled the tariffs were illegal. Lucy Hough speaks to international editor Chris Michael – watch on YouTube. Help support our independent journalism at theguardian.com/infocus

Sperm counts are in decline worldwide, and testosterone levels are said to be plunging, but male infertility still carries a stigma. Prof Michael Carroll on what every man should know. Help support our independent journalism at theguardian.com/infocus

Senior China correspondent Amy Hawkins on China’s embrace of AI, from medical avatars to food delivery drones and state surveillance. Help support our independent journalism at theguardian.com/infocus