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Earlier this month, the Olympics for hagglebots was held: the 11th annual competition for artificial intelligence (AI) that has been trained to negotiate.

Featuring Holly Krieger... Check out Brilliant (and get 20% off their premium service): https://brilliant.org/numberphile (sponsor) More links & stuff in full description below ↓↓↓ With Dr Holly Krieger from Murray Edwards College, University of Cambridge. Check out the monster dollar game s

British photographer George Logan documents the "natural beauty, drama and raw ferocity" of wild lions in Africa. Logan has spent the last 10 years photographing lions in Kenya, Ethiopia, Zambia, Malawi, Botswana, Namibia and South Africa.

Sara Stewart strolls into a small Mexican restaurant in Los Angeles and orders a torta, a type of sandwich. To pay she simply looks at her reflection in a small LCD screen attached to the cashier's counter. Then to add her preferred amount of tip she flashes a quick peace sign at the monitor.

Professor Ed Copeland shows a proof by Joseph "Voldemort" Fourier that e is irrational. Check out episode sponsor http://KiwiCo.com/Numberphile for 50% off your first month of any subscription. The crates are great! More links & stuff in full description below ↓↓↓ Ed Copeland is a physics pro

Jim Haynes was both an icon and a relic of the Swinging Sixties, an American in Paris who was famous for inviting hundreds of thousands of strangers to dinner at his home. He died this month. Last February, I took my last trip abroad before lockdown closed in on us.

The famous naturalist was haunted by the question of how the first flowering plants evolved. Darwin feared this inexplicable puzzle would undermine his theories of evolution, says Prof Richard Buggs.

Chinese rescue teams say it might be more than two weeks until they can save a group of miners trapped hundreds of metres underground. They have been trapped since an explosion closed the entrance tunnel to the Hushan gold mine in Shandong province on 10 January.

Navigating the thronging streets of Lagos, Nigeria, is a challenge at the best of times. But during the rainy seasons, the city's streets can become almost impassable. Home to more than 24 million, Lagos is Nigeria's economic powerhouse, making it a destination for people seeking new opportunities.

Hungary has become the first country in the European Union to give preliminary approval to the Russian coronavirus vaccine, Sputnik V.

At first, the satellite images appear to be of grey blobs in a forest of green splotches - but, on closer inspection, those blobs are revealed as elephants wandering through the trees. And scientists are using these images to count African elephants from space.

If we’re already working in isolation at home, why do we miss working with our heads similarly down in a public setting? Some of the most successful people in history have done their best work in coffee shops.

"Healthy, female workers between the ages of 20 and 40 wanted for a military site," reads the job advertisement from a 1944 German newspaper. Good wages and free board, accommodation and clothing are promised. What is not mentioned is that the clothing is an SS uniform.

The government is planning new laws to protect statues in England from being removed "on a whim or at the behest of a baying mob", Communities Secretary Robert Jenrick has said. Writing in the Sunday Telegraph, he said generations-old monuments should be "considered thoughtfully".

The Spanish workers of La Línea de la Concepción are at the ready to celebrate the removal of the Gibraltar border controls. And they have reason to. This small coastal town bordering Gibraltar is one of the poorest in Spain.

On 15 January 2001, two American entrepreneurs - Jimmy Wales and Larry Sanger - launched an online encyclopedia. It was called Wikipedia. Despite much criticism early on about inaccuracies, it has gone on to be hugely successful.

Havana may be Cuba's most famous city, but tiny Trinidad is its most enchanting. With its cobblestone streets, pastel-coloured 18th- and 19th-Century palaces, and manicured Baroque plazas, the 500-year-old Unesco-inscribed marvel is one of the finest colonial towns in the Americas.

More than 200 years after the electric eel inspired the design of the first battery, it has been discovered that they can co-ordinate their "zaps". Researchers working in the Amazon filmed eels gathering in packs to herd prey, then stunning them with a synchronised electric shock.

Most people who have had Covid-19 are protected from catching it again for at least five months, a study led by Public Health England shows. Past infection was linked to around a 83% lower risk of getting the virus, compared with those who had never had Covid-19, scientists found.

Hundreds of people rioted in Brussels on Wednesday night over the death of a 23-year-old in police custody at the weekend. Video from the scene shows King Philippe's car being hit by projectiles as it passed through the area.

Naples has pizza, Rome has cacio e pepe and Sicily has cannoli.

Donald Trump has become the first president in US history to be impeached twice, after being charged with "incitement of insurrection" over last week's deadly storming of Congress. The House of Representatives accused Mr Trump of encouraging violence with his false claims of election fraud.

The Tower of London's "queen" raven is missing and feared dead, according to staff at the fortress. Merlina, who joined the flock in 2007, has not been seen for several weeks.

We've all been there - brain fog makes us forget our password and after eight frantic attempts, we have just two left.