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This is the first in a four-part series looking at the energy revolutions that drove human history. In this programme Justin Rowlatt goes right back to the origin of our species two million years ago to explore how the mastery of fire by early humans transformed our metabolism, helping us to evolve our uniquely energy-hungry brains.

The physical evidence for early use of fire is frustratingly thin on the ground, according to archaeologist Carolina Mallol. But primatologist Jill Pruetz says she has learned a lot from observing chimpanzees interact with wildfires on the African savanna.

Research collaborators Rachel Carmody and Richard Wrangham theorise that our ancestors' unique ability to cook their food transformed the way our bodies access the energy it contains - something Justin seeks to test out by going on a raw food diet. The bounty of metabolic energy it delivered may have enabled us to become the formidably intelligent species we are today, according to neuroscientist Suzana Herculano-Houzel, transforming us into prolific hunters who conquered the world.

Producer: Laurence Knight

In the decade leading up to the Iranian revolution of 1979, the Shah's wife, Farah Pahlavi spent much of her time encouraging the building of museums and institutions intended to celebrate the art and craft of the country. But alongside buildings housing priceless carpets and glassware, she was also keen to use the country's oil wealth to bring examples of modern western art to the capital, Tehran. The result was the collection of works by Jackson Pollock, Henry Moore, Picasso, Bacon, Chagall and Renoir. It remains one of the most valuable collections outside Europe and the US. She even commissioned a portrait by Andy Warhol.

Producer: Tom Alban

On the eve of what would have been the world's largest share listing, Ant Financial, estimated to float for over $300bn, it's founder Jack Ma, the Chinese billionaire mysteriously disappeared. Things started to go wrong for Ma after he told a room full of banking regulators that their methods were out of date and not fit for purpose. Shortly afterwards, the Chinese government cancelled the listing and Jack went silent. The extroverted charismatic billionaire, who once flourished in the public eye, simply did not show up at key events.

It's happening more and more often in China: some of the country's most famous and powerful people are disappearing after coming into conflict with the Communist Party. China's most famous actress, the Chinese head of the international police agency Interpol and even a top news presenter all disappeared.

So what's happened to Jack Ma? In this program journalist Celia Hatton, who spent 15 years living and reporting in China, investigates. Celia asks if Ma is just keeping a low profile or is something more sinister at play? What does Jack Ma’s disappearance tell us about China's relationship with big business, the future direction of its economy and its attitude towards the growing number of domestic tech billionaires?

Producer: Rajeev Gupta

(Clips used: CBS, CNN, World Economic Forum, Alibaba Group, Financial Times)

In a dusty attic in the Yorkshire hills sits the life’s work of John Kingston, a man who spent decades investigating whether his own stepfather, Stanislaw Chrzanowski, was, in fact, a Nazi war criminal.

Whilst most knew ‘Mr Stan’ as a friendly pensioner, growing fruit for his neighbours and zipping around his village in the Midlands on his mobility scooter, John was convinced he was hiding a dark secret. Unable to shake the terrifying bedtime stories his stepdad told him as a child, John spent his adult life trying to expose the truth.

When John died in 2018, the year after his stepfather, the files, photographs, and hours of secret recordings he made were left boxed up in his attic, until now, when they were discovered by BBC journalist Nick Southall.

Nick has been investigating the extraordinary story of Stanislaw Chrzanowski for over 5 years, trying to establish if this man, who settled here to help Britain rebuild after the war, had also helped the Nazis kill tens of thousands of Jews in his homeland of Belarus.

Told using the archive of secret recordings found in John’s attic, and hearing from eyewitnesses who knew Stan Chrzanowski as ‘a butcher’, this often chilling story takes us from Birmingham, to Berlin to the Killing Fields of Belarus. In it, Nick seeks to answer two questions - was ‘Mr Stan’ the monster his stepson believed he was? And, if so, what was the real reason he never saw justice for his crimes?

Reporter: Nick Southall

In 2016 when producer Georgia first met him, Demille was a cycle courier in his early twenties, taking his company to a tribunal over better working conditions. He was fired-up, political, and excited about a case he would go on to win.

For the past five years, Georgia and Demille have been meeting and recording.

Demille’s story is one of being young and trying to stay afloat in the gig economy; of resilience and hope and trying to find control over his city and life.

Producer: Georgia Catt

David Mitchell investigates meetings from the ancient "thing" to zoom. Also on the agenda: executive coach Sophie Bryan teaches David to chair a meeting; fellow comedian Russell Kane explores how different personality types behave in meetings; and Dutch sociologist Wilbert van Vree sums up several millennia of meetings history.

Producer: Chris Ledgard

Chris van Tulleken explores the human behaviours causing pandemics, paying the price for getting too close to animals by degrading their territory and allowing viruses to jump. What's clear is that Covid-19 was inevitable; that a coronavirus would jump in Asia was predicted in at least 3 papers in early 2019. It's a symptom of degraded ecosystems leading to intimate contact with animals we don't normally encounter.

When examining the origins of Covid-19, perhaps the most amazing aspect is the number of different possibilities. Bats as medicine, bats as food, bat transmission to other intermediate animals - mink farmed for fur or raccoon dogs hunted as game. We don't know if it jumped in a home or a wet market or in a cave. Chris talks to NERVTAG virologist Prof Wendy Barclay who explains why she thinks it's not the case that it escaped from a lab. Plus ecologist and bat enthusiast Prof Kate Jones argues that invasive human behaviours are offering these viruses multiple chances to jump into people – mostly all totally hidden from sight - but is optimistic as the UK Government asks her to advise on spillover risks and how to achieve sustainable landscapes. While Dr Peter Daszak and Dr William Karesh from EcoHealth Alliance highlight how climate change and pandemic risk are interconnected; all the solutions already identified to tackle global warming will also help prevent the next virus from jumping.

Produced by Erika Wright

Despite the overwhelming evidence that human sexuality is innate and immutable over time, proponents of conversion 'therapies' have sought to change or 'fix' queer peoples' sexuality for much of the 20th century. Presenter Caitlin Benedict speaks with scientists, historians and survivors to uncover the heinous practices that LGBT+ people were subjected to with the guise of changing their sexuality, including lobotomies and chemical castration.

During the summer of 2020, Prime minister Boris Johnson called conversion therapy 'absolutely abhorrent' and promised to 'bring forward plans to ban it'. Caitlin speaks with one of the people responsible for a recent ban on change and suppression practices in the Australian state of Victoria, earlier this year, and seeks to understand how easy a ban will be to implement.

And how will any ban on conversion practices affect the trans community? Caitlin speaks with the MP Alicia Kearns about why she thinks any bill to enact a ban must protect trans people while ensuring that psychotherapists are still able to provide affirmative support for their patients.

Presenter: Caitlin Benedict (they/them)

Seriously is home to the world’s best audio documentaries and podcast recommendations, and host Vanessa Kisuule brings you two fascinating new episodes every week.

Psychologist Kimberley Wilson and Dr Xand van Tulleken take a journey around the human body, to find out what it can tell us about our innate capacity for change. In this episode, Kimberley and Xand focus on the heart, which has been branded the seat of emotion by generations of poets and songwriters.

They find out whether it’s medically possible to die from a broken heart, hear from a woman who lived for 16 months without a human heart, and Xand opens up about how Long Covid is affecting his heart.

Producer: Dan Hardoon