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The ObserverDolphinsIn the 1960s, Margaret Lovatt was part of a Nasa-funded project to communicate with dolphins. Soon she was living with ‘Peter’ 24 hours a day in a converted house. Christopher Riley reports on an experiment that went tragically wrong Like most children, Margaret Howe Lovatt grew up with stories of talking animals. “There was this book that my mother gave to me called Miss Kelly,” she remembers with a twinkle in her eye.

ILsugar 02 jor 0407 031 Photograph: Peter GamlenIn 1972, a British scientist sounded the alarm that sugar – and not fat – was the greatest danger to our health. But his findings were ridiculed and his reputation ruined. How did the world’s top nutrition scientists get it so wrong for so long? by Ian LeslieRobert Lustig is a paediatric endocrinologist at the University of California who specialises in the treatment of childhood obesity.

Blue Angel... Olsen Photograph: Amanda MarsalisView image in fullscreenBlue Angel... Olsen Photograph: Amanda MarsalisMusicShe made her name with angsty alt-country, but now is tired of being blue. The singer-songwriter discusses her new album and why it’s bigger than gender and sex Of all the artists you’d never expect to find yourself interviewing in a bikini, Angel Olsen is up there with singing nuns the Siervas. A former vocalist for canonical alt-country artist Will Oldham, she made her solo breakthrough with the 2014 album Burn Your Fire For No Witness, which recharged old-time country with grunge and cloaked folk melodies in reverb.

Alexandria Ocasio-Cortez This article is more than 2 years old‘First of all, I’m taller’: AOC dismisses Greene’s ‘little communist’ attackThis article is more than 2 years oldMarjorie Taylor Greene has harassed Ocasio-Cortez on Capitol Hill, prompting the progressive to raise concerns for her security Alexandria Ocasio-Cortez has dismissed comments in which the Georgia Republican extremist Marjorie Taylor Greene called her a “little communist” and said she should be locked up, tweeting: “First of all, I’m taller than her.

Shocking … Marina Abramović’s original performance in Naples in 1974. Photograph: Donatelli Sbarra/Courtesy of the Marina Abramović ArchivesShocking … Marina Abramović’s original performance in Naples in 1974. Photograph: Donatelli Sbarra/Courtesy of the Marina Abramović ArchivesThe great women's art bulletinArt and designIn 1974, Marina Abramović dared an audience to use chains, lipstick and knives on her body – and their willingness to abuse her revealed frightening truths about misogyny

ObituaryNicholas ClaySwashbuckling actor who conquered theatre, film and televisionNicholas Clay, who has died of cancer aged 53, was a superb Lancelot in John Boorman's film Excalibur (1981), a prominent player during Sir Laurence Olivier's golden Old Vic period in the 1970s, a television star, and an actor who loved teaching - and was good at it. We first met in the early 1970s, at the Old Vic. Nick had named parts, I was "

Pacific islands This article is more than 8 months oldPacific islands warned of possible small tsunamis after earthquake near New CaledoniaThis article is more than 8 months oldChance of waves up to 1 metre in Vanuatu, while under 30cm likely in 25 island groups including Tonga and Tuvalu, US authorities say People across the South Pacific have been told to avoid coastal areas due to the risk of small tsunami waves after a 7.

TattoosInterviewPainted ladies: why women get tattoosIntroduction: Jenn Ashworth. Photographs: Christina Theisen and Eleni StefanouWhy are so many women getting tattoos? Eight inked women reveal the appeal of permanent markings. Photographs by Christina Theisen and Eleni StefanouThe first tattoo I ever saw belonged to my grandad. He had it done in Scotland during his national service in the 50s, so the tattoo must have been more than 30 years old when I became fascinated by it.

The ObserverArchaeologyNew research reveals that the so-called crack troops of Rome were in fact guilty of crimes against fashionThey have been the subject of innumerable romantic books and films, including the forthcoming epic, The Eagle of the Ninth, directed by Kevin Macdonald. But new evidence this week has revealed that life for a soldier in the Roman Ninth Legion had a more mundane side. A newly excavated site near Healam Bridge fort, North Yorkshire, a military outpost used by the Ninth, has shown soldiers there had their own industrial estate nearby to provide them with clothes, pottery and other equipment.