Fresh questions for Facebook over when it knew of data harvesting

Allegations come as US prosecutors investigate claims of cover-up claims

Facebook is facing explosive new questions about when senior executives knew of Cambridge Analytica’s abuse of users’ data, one year on from when the scandal first broke, as federal prosecutors investigate claims that the social media giant has covered up the extent of its relationship with the firm.

The Observer has also learned that a Facebook board member and confidant of its CEO Mark Zuckerberg met Christopher Wylie, the Cambridge Analytica whistleblower, in the summer of 2016 just as the data firm started working for the Trump campaign.

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Major study suggests Apple Watch can detect irregular heartbeat

More work needed to see if wearables can help screen for heart problems, but researchers call study encouraging

A huge study suggests the Apple Watch can detect a worrisome irregular heartbeat – but experts say more work is needed to tell if using wearable technology to screen for heart problems really helps.

More than 419,000 Apple Watch users signed up for the study, which was funded by Apple and the largest ever to explore screening seemingly healthy people for atrial fibrillation (A-fib), a condition that if untreated eventually can trigger strokes.

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The man who takes tech apart – so we can learn how to fix it

Todd McLellan wants his photographs of disassembled gadgets to help people understand how stuff works

By his own admission, photographer Todd McLellan was “kind of a weird kid”. As an eight-year-old, the Canadian had a workbench in his bedroom, where he would use a hammer, a soldering iron and an oscilloscope to tinker around with household objects. He particularly enjoyed taking apart his brother’s toy cars to try to see what was inside. “I thought the little seats were so cool,” he says now. “But it was so disappointing there were no pedals or steering wheel. I was like: ‘What – is that it?’”

McLellan rarely experiences the same disappointment now. For the past decade, the 42-year-old has earned a name for himself by taking apart everyday objects, neatly aligning their components, and photographing the results. “Some of them, I think there’s going to be nothing to it, and I schedule two, three hours of my day to take them apart,” he says. “And then I get started, and it’s like: ‘Oh, no. So many pieces.’”

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Five of the best noise-cancelling headphones

Blocking out annoying sounds on flights or the commute with these options priced from £80

Daily life is stressful enough without being subjected to the noise of others. Thankfully noise cancelling headphones can help by actively blocking oppressive distractions, whether it’s for flights, the commute, or just in the office, with effective options costing £80 and up.

Here’s a quick guide to separate the wheat from the chaff.

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