People want more seafood than the oceans can sustainably supply, so a German firm aims to plug that gap with cultivated fish – but are consumers ready to buy it?

The redbrick offices, just north of Hamburg’s River Elbe and a few floors below Carlsberg’s German headquarters, are an unexpectedly low-key setting for a food team gearing up to produce Europe’s first tonne of lab-grown fish.

But inside Bluu Seafood, past the slick open-plan coffee and cake bar, the rooms are dominated by gleaming white tiles, people bustling about in lab coats, rows of broad-bottomed beakers and pieces of equipment more at home in a science-fiction thriller. A 50-litre tank (a bioreactor) is filled with what looks like a cherry-coloured energy drink. The liquid, known as “growth medium”, is rich with sugars, minerals, amino acids and proteins designed to give the fish cells that are added to it the boost they need to multiply by the million.

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From Everest to Machu Picchu, we can’t get enough of those ‘must-see’ places. It’s time to show some restraint

Climbing Everest used to be an even more dangerous pursuit than it is today, requiring huge bravery, endurance and skill. Even then the mountain could kill. A century ago, it claimed the lives of two of Britain’s finest climbers, George Mallory and Sandy Irvine .

The world’s highest mountain eventually succumbed to human challenge when, almost three decades later, Edmund Hillary and Tenzing Norgay carried the flags of Britain, the UN, and Nepal to its summit on 29 May 1953. Sporadic trips involving handfuls of explorers continued over succeeding years.

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Investigation finds groups hosting Islamophobic attacks on London mayor Sadiq Khan, white supremacist slogans and antisemitic conspiracy theories

Conservative party staff and activists are secretly operating a network of Facebook groups that have become a hotbed of racism, misinformation and support for criminal damage.

An investigation has identified 36 groups that appear to be separate grassroots movements opposing the expansion of ultra-low emission zone (Ulez) schemes to reduce air pollution. They do not say they were set up by the Conservatives as part of a coordinated political campaign.

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Total deaths reach 76 and more than 130,000 displaced as weeks of flooding also affects east African neighbours

Seventy-six people in Kenya have died because of flooding triggered by torrential downpours since March, the government has said, warning residents “to brace for even heavier rainfall”.

Kenya and its east African neighbours have been battered by stronger than usual rain in recent weeks, compounded by the El Niño weather system.

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Man is being treated for injuries to arm, leg and stomach after attack in shallow waters

A British man is in intensive care after an “unusual” shark attack on the Caribbean island of Tobago.

The 64-year-old man is receiving critical care after the bull shark attack left him with injuries to his left arm, left leg and stomach, Tobago’s Division of Tourism, Culture, Antiquities and Transportation said.

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Home workers aim to tackle smelly athleisure clothing, save money and be kinder to the environment

For years, laundry detergents have focused their cleaning power on stain removal and getting whites white but now a new invisible enemy has emerged in the shape of the musty smell that clings to your gym gear.

The shift to remote working has fuelled the popularity of “athleisure ” clothing such as T-shirts, joggers and leggings which, rather than shirts and dresses, are now the default work wardrobe of many Britons.

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Beetroot leaves are nutritious, thrifty and work brilliantly mixed into a hash with other leftover vegetables. Just top with a fried egg and away you go …

Hash is a clever way to use up the day before’s leftovers, because almost any combination of chopped meat and vegetables, all fried together and topped with a fried egg, is scrumptious. I’ve focused today’s recipe around a whole beetroot, including its leaves, which are even more nutritious than the root itself, full of vitamins A, B6, C and K, and rich in iron, magnesium and potassium.

Discover this recipe and over 1,000 more from your favourite cooks on the new Guardian Feast app , with smart features to make everyday cooking easier and more fun

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Inaugural contest at Crab Museum in Margate allows crustaceans to pick the winner, with the help of tinned fish used as bait

How did the crab get out of prison? And why did the crab get bad grades?

The answers to these conundrums and other clawsome jokes were among the competitors for the inaugural World’s Funniest Crab Joke competition, held by the Crab Museum in Margate to celebrate International Crab Day.

What do you call a red crab piggybacking another red crab all around the town? A double-decapod.

A horseshoe crab walks into a bar. “Why the ventral face?” the bartender asks. The crab replies: “Mind your own business and please tip a pint of lager and a packet of crisps on to the pub carpet.”

How did the crab get out of prison? It used its escape claws.

Why didn’t the crab help the chicken cross the road? Because it was eaten by a pelican crossing.

What did the sea urchin say to the crab? Please sir, can I have some claw?

What format do you have to save photos of crab soup on to? Floppy bisque.

A man walks into a restaurant with a crab under his arm and says: “Do you make crab cakes?” The manager answers: “Yes, we do.” “Good,” says the man, “because it’s his birthday.”

How do barnacles get around? A taxi crab.

Why did the crab cross the road? It didn’t. It used the sidewalk.

Why did the crab get bad grades? Because it was below C level.

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As mayor aims to win third term, what has he achieved so far on air pollution, the climate crisis and nature?

When Sadiq Khan launched his campaign for a third term as Labour mayor of London, he put his green policies front and centre, highlighting his work on air pollution, the climate crisis and nature.

For seasoned Khan watchers, this came as little surprise. The mayor, who last year published a book called Breathe: Seven Ways to Win a Greener World , has been widely praised for his work tackling air pollution, as well as his efforts on nature restoration and getting London to net zero by 2030.

The introduction and expansion of the ultra-low emission zone, which excludes the most polluting vehicles from the capital and has contributed to roadside N0 ₂ emissions dropping by 50%.

The introduction of thousands of new electric buses and taxis, and the continued expansion of the cycle network and promotion of walking.

A rewilding programme that has reintroduced a range of species, including beavers , expanded green spaces, and included a mass tree-planting programme.

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