Used in healing practices for centuries, modern versions of these spiky mats are increasingly popular, and many people find them invaluable. Here’s what the science says

Ever since Keith, 39, from Kansas, was in a car accident in 2023, he has lived with “pretty much constant mid-back and shoulder pain”. Over-the-counter treatments didn’t touch the sides and he didn’t want to resort to opiates. “Having exhausted everything there was solid science for with no satisfaction, I delved into acupressure,” he says. He bought an acupressure mat made of lightly padded fabric, studded all over with tiny plastic spikes, to lay his back on, and was surprised to find that it actually helped.

Acupressure mats, also known as Shakti mats, are inspired by the beds of nails that Indian gurus used for meditation and healing more than 1,000 years ago. While today’s mats have the nonthreatening sheen of a luxury wellbeing product, the spikes are no joke. In fact, the internet serves up a plethora of images of flaming, dented backs after their use – although you’re unlikely to seriously injure yourself using them. While the mats have been widely available for more than a decade, there has been a recent surge in mainstream interest. You may have seen them heavily advertised on your social media feed, the most prominent brand being Shakti Mat, made in India and costing up to £99 for the premium model. But Amazon is full of acupressure mats and pillows – Lidl recently stocked a mat and pillow combo for a tenner. Yet there is still no compelling evidence that they relieve stress, pain and sleep problems, or help with any other unmet health needs.

I’ve worked as a surgeon in disaster zones. Nothing compares to the nightmare I saw in Iran’s hospitals when the state started shooting protesters

By 8 January, Iran’s anti-regime protests that began in late December had spread across the country with reports of at least 45 people killed by security forces. Over the next three days the regime appears to have instigated a brutal crackdown on protesters that is now estimated to have led to the deaths of more than 5,000 people.

By the time I reached the hospital in Tehran on Thursday (8 January) night, the sound of the city had already changed.

The performer was found dead in ‘unexpected’ circumstances in her London flat in 2023. Why are her loved ones still waiting for an explanation?

In commemorations and memorials after her death, the view was unanimous: Heklina had been a bitch. In the world of San Francisco’s drag scene, where she made her name, this wasn’t meant as an insult. Heklina had been a legendary performer whose stage persona was equal parts raunchy and abrasive, slinging insults known as “reads” in fine drag tradition. “Yeah, she was a bitch,” recalls her longtime collaborator Sister Roma, “but she was a bitch in the best possible way.”

Seven weeks after Heklina died, a memorial for her closed down San Francisco’s Castro Street, with crowds gathering to watch the event on giant screens. Among comedy routines and performances, the city’s queer community paid homage to Heklina not just as a drag queen, but also a shrewd promoter whose long-running event series Trannyshack created a platform for countless drag artists to cut their teeth, including those who went on to become stars on the hit show RuPaul’s Drag Race: Alaska, BenDeLaCreme and Jinkx Monsoon.

The long-running series in which readers answer other readers’ questions on subjects trivial and profound considers a heartfelt matter

• This week’s question: To shred or not to shred: is it OK to recycle sensitive documents?

How can we accept that what feels like overwhelming love for someone is unrequited, and how can we get over it? HH, Suffolk, by email

Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published next Sunday.

Signed at 13 and dropped by 16, Beer’s path to stardom has not been easy. Now 26, she says she’s finally making music for herself and happy to wear her heart on her sleeve

Madison Beer may only be 26, but she is something of a veteran in the pop industry. She got her start at 13, after Justin Bieber tweeted a link to a YouTube video of her covering Etta James’s At Last, and has spent the intervening decade-plus toiling away in mainstream pop, amassing a huge gen Z fanbase in the process – including more than 60 million followers between Instagram and TikTok. It’s an understatement to say that her career has been a slow burn: the day before we speak, it’s announced that her single Bittersweet, released in October, has become her first song to reach the US Hot 100 chart, entering at No 98. When I suggest congratulations are in order, she shrugs off the achievement. “I’m obviously super excited and thankful whenever a song performs well, but I think I’m at the point where I love what I make, and I’m proud of it regardless,” she says amiably, before laughing. “Only took me like, 15 years! But it’s cool.”

Beer’s attitude is indicative of someone whose career has progressed in fits and starts, a far cry from the kind of meteoric rise that fans and onlookers sometimes expect to see in aspirant pop stars. As she prepares for the release of her third album, Locket, she is in prime position to break through to pop’s upper echelon: Her 2023 album Silence Between Songs featured the sleeper hits Reckless and Home to Another One, the latter a sorely underrated Tame Impala-inspired cut, and in 2024 she released Make You Mine, a Top 50 single in the UK which was nominated for a best dance pop recording Grammy.

In the search for stability, some western nations are turning to a country that many in Washington see as an existential threat

If geopolitics relies at least in part on bonhomie between global leaders, China made an unexpected play for Ireland’s good graces when the taoiseach visited Beijing this month. Meeting Ireland’s leader, Micheál Martin, in the Great Hall of the People in Beijing, China’s president, Xi Jinping, said a favourite book of his as a teenager was The Gadfly, by the Irish author Ethel Voynich, a novel set in the revolutionary fervour of Italy in the 1840s.

“It was unusual that we ended up discussing The Gadfly and its impact on both of us but there you are,” Martin told reporters in Beijing.

Allies of Greater Manchester mayor say No 10 has ‘chosen factionalism’ as decision leads to a furious backlash

Labour’s national executive committee (NEC) has blocked Andy Burnham’s request to seek selection for the Gorton and Denton byelection, setting off an immediate and furious row within the party.

In a vote of the 10-strong “officers’ group” of the NEC, only one person, Lucy Powell, the party deputy leader and a close ally of Burnham, voted to allow the Greater Manchester mayor to compete to be a candidate in the seat vacated by Andrew Gwynne this week.

Pair testify that Pretti did not hold weapon and was trying to help woman federal agents had shoved to the ground

Two witnesses to the killing of Alex Pretti have said in sworn testimony that the 37-year-old intensive care nurse was not brandishing a weapon when he approached federal agents in Minneapolis on Saturday, contradicting a claim made by Trump administration officials as they sought to cast the shooting of a prone man as an act of self-defense.

Their accounts came in sworn affidavits that were filed in federal court in Minnesota late Saturday, just hours after Pretti’s killing, as part of a lawsuit brought by the ACLU on behalf of Minneapolis protesters against Kristi Noem and other homeland security officials directing the immigration crackdown in the city.

Survey finds schools referring homeless children to food banks as record numbers live in temporary housing

Schools are regularly referring homeless children to food banks, driving them to classes and washing their clothes, according to research.

A survey conducted by the housing charity Shelter and NASUWT, also known as the Teachers’ Union, asked 11,000 teachers about their experiences of working with children living in temporary accommodation.

Survey reveals ‘mismatched AI expectations’ between views of employers and staff over impact on careers

More than a quarter (27%) of UK workers are worried their jobs could disappear in the next five years as a result of AI, according to a survey of thousands of employees.

Two-thirds (66%) of UK employers reported having invested in AI in the past 12 months, according to the international recruitment company Randstad’s annual review of the world of work, while more than half (56%) of workers said more companies were encouraging the use of AI tools in the workplace.