What's it like living underwater for two weeks? What's the trickiest part of training to be an astronaut? What are the most memorable sights you see from space? Several extreme questions, all of which can be answered by one man: Major Tim Peake.

After a childhood packed with outdoor adventures, via the Cub Scouts and school Cadet Force, Tim joined the British Army Air Corps and became a military flying instructor then a test pilot; before eventually being selected as a European Space Agency (ESA) astronaut. In 2015, Tim became the first British ESA astronaut to visit the International Space Station.

Over the course of a six-month mission, he took part in more than 250 scientific experiments and worked with more than two million schoolchildren across Europe.

In a special New Year’s episode recorded in front of an audience at London’s Royal Society, Professor Jim Al-Khalili talks to Tim about his lifelong passion for adventure, the thrill of flight and why scientific experiments in space are so important.

Presented by Jim Al-Khalili

What effect will warming temperatures have on health? One place to look for answers is Bulgaria. In the summer of 2023, Bulgaria experienced numerous heatwaves, leading to the country experiencing one of the highest rates of heat mortality in Europe. But how are these numbers calculated? How exactly does heat affect us? Who is most likely to suffer from ill health due to heat? And how can we protect ourselves in an increasingly warming world? Along with a panel of experts, Claudia Hammond will explore these questions and more with a live audience at the Sofia Science Festival in Bulgaria. Are we prepared for how rising temperatures will affect our health? This programme aims to find out.

From growing up in a progressive Denmark to studying mathematics at a gender-segregated Cambridge University, Inge Lehmann had to power through the shock of cultural change to pursue her love of mathematics. Whilst managing several seismological stations, Inge notices the peculiar readings in the data she was collecting. Was the Earth’s composition actually different to what the experts had thought?

Dr Julia Ravey and Dr Ella Hubber tell the story of Danish seismologist Inge Lehmann who used earthquakes to uncover the truth about the composition of the Earth’s inner core.

Presenters: Ella Hubber and Julia Ravey

(Photo: Inge Lehmann Credit: Neuhaus, Even (6.2.1863-20.4.1946) /Royal Danish Library)

Dr Julia Ravey and Dr Ella Hubber are both scientists, but it turns out there’s a lot they don’t know about the women that came before them. In Unstoppable, Julia and Ella tell each other the hidden, world-shaping stories of the scientists, engineers and innovators that they wish they’d known about when they were starting out in science. This week, the story of a woman who gained her education by herding sheep during her childhood to becoming one of Africa’s most prominent scientists.

Born under Apartheid in South Africa, Tebello Nyokong and her family uprooted their lives to escape the unequal education system enforced upon Black South Africans. After herding sheep proved she could do anything a boy could do, Tebello ended up studying science and found a love for chemistry. In the face of limited opportunities, she once again uprooted her life and took her studies oversees, but this was when she was introduced to something huge: a new, ground-breaking cancer treatment. Now Tebello is using nanotechnology to get this therapy off the ground, all while she fights to make Africa a science superpower.

Presenters: Ella Hubber and Julia Ravey

(Image: Professor Tebello Nyokong. Credit: Professor Tebello Nyokong)

Dr Julia Ravey and Dr Ella Hubber are both scientists, but it turns out there’s a lot they don’t know about the women that came before them. In Unstoppable, Julia and Ella tell each other the hidden, world-shaping stories of the scientists, engineers and innovators that they wish they’d known about when they were starting out in science. This week, a Māori marine scientist is combining indigenous knowledge with marine science to save the oceans that are so integral to her heritage.

Growing up in 1970s New Zealand, Kura-Paul Burke faced stigma due to her Māori roots. But, after finding herself studying marine science as an adult, Kura leaned on her heritage to take on a problem where many had already failed: restoring a lost population of precious, green-lipped mussels. Discover how Māori ancestresses, tribal elders and centuries-old knowledge inspired the ingenious methods of Aotearoa's first female Māori professor of marine science.

Presenters: Ella Hubber and Julia Ravey

(Image: Dr Kura Paul-Burke. Credit: Dr Kura Paul-Burke)

Dr Julia Ravey and Dr Ella Hubber are both scientists, but it turns out there’s a lot they don’t know about the women that came before them. In Unstoppable, Julia and Ella tell each other the hidden, world-shaping stories of the scientists, engineers and innovators that they wish they’d known about when they were starting out in science. This week, the story of a young PhD student whose discovery of a previously unknown object in the universe won a Nobel Prize...but not for her.

On a cold night in 1967, Jocelyn Bell Burnell sits alone in an observatory, reading the data from a radio telescope. As the pattern in the data suddenly changes, she realises she has discovered an entirely new kind of cosmic phenomenon. Uncover her life story, from getting snubbed for the Nobel Prize to paving our knowledge of distant and invisible aspects of the universe.

Presenters: Ella Hubber and Julia Ravey

(Image: Jocelyn Bell Burnell attends the 2019 Breakthrough Prize at NASA Ames Research Center on November 4, 2018 in Mountain View, California. Credit: Kimberly White/Getty Images for Breakthrough Prize)

Dr Julia Ravey and Dr Ella Hubber are both scientists, but it turns out there’s a lot they don’t know about the women that came before them. In Unstoppable, Julia and Ella tell each other the hidden, world-shaping stories of the scientists, engineers and innovators that they wish they’d known about when they were starting out in science. This week, a Chinese malariologist who hunted for clues in ancient medical texts to find a cure for one of the world’s deadliest diseases.

During a time of global political tension, the Chinese government set up a top-secret project to help communist troops in North Vietnam struggling with malaria. And tasked with this mission was young scientist, Tu Youyou. With a drive to help people after falling ill as a teenager and seeing the horrors of malaria firsthand, Tu turned to traditional Chinese medicine to look for potential treatments. And, after finding a hit, decided she should be the one to trial it...

Named as arguably the most important pharmaceutical discovery in the last half-century, winning the 2015 Nobel Prize, discover how one woman used an overlooked herb combined with modern science to ultimately save millions of lives.

Presenters: Ella Hubber and Julia Ravey

(Image: Chief Professor Tu Youyou, laureate of the Nobel Prize in Physiology or Medicine acknowledges applause after she received her Nobel Prize from King Carl XVI Gustaf of Sweden during the Nobel Prize Awards Ceremony at Concert Hall on December 10, 2015 in Stockholm, Sweden. Credit: Pascal Le Segretain/WireImage via GettyImages)

Dr Julia Ravey and Dr Ella Hubber are both scientists, but it turns out there’s a lot they don’t know about the women that came before them. In Unstoppable, Julia and Ella tell each other the hidden, world-shaping stories of the scientists, engineers and innovators that they wish they’d known about when they were starting out in science. This week, the story of an Indian conservationist who combines stork preservation with female empowerment.

(Image: Purnima Devi Barman. Credit: Purnima Devi Barman)

As the famous frog once said, it's not easy being green. And when it comes to decarbonising industry, indeed, reducing emissions of all sorts, the task is a complex one.

Fossil fuels are used to manufacture some of mankind’s most ubiquitous products, from plastics to cement to steel; and even in areas where we’re trying to improve our footprint, there are repercussions. Mining lithium for electric car batteries isn’t exactly without impact. Add to the mix stories of corporations prioritising profits, and governments focusing on short-term popular policies – and it would be easy to feel disheartened.

Professor Anna Korre says her role is to be the champion of science in this debate: providing clear evidence to help reduce environmental impacts, while allowing vital production processes to continue.

Anna is an environmental engineer at Imperial College London and Co-Director of the university’s Energy Futures Lab. Her work has led to a risk model that's now used in mining operations around the world – and her current research into underground CO2 storage could hold the key to decarbonising British industry. But as she tells Jim Al-Khalili, social and family expectations when she was growing up in her native Greece meant her successful career in engineering very nearly didn't happen...

Rosalie David is a pioneer in the study of ancient Egypt. In the early 1970s, she launched a unique project to study Egyptian mummified bodies using the techniques of modern medicine. Back then, the vast majority of Egyptologists regarded mummies as unimportant sources of information about life in ancient Egypt. Instead they focussed on interpreting hieroglyphic inscriptions, the written record in papyrus documents and archaeological remains and artefacts. Rosalie David proved that the traditionalists were quite wrong.

Professor David’s mummy research started at the Manchester Museum when she began to collaborate with radiologists at in Manchester, taking the museum’s mummies for x-rays at the hospital. Her multi-disciplinary team later moved to a dedicated institute at the University of Manchester, the KNH Centre for Biomedical Egyptology. Over the decades, the team there has made remarkable discoveries about disease and medicine in ancient Egyptian society, providing a new perspective on the history of medicine and giving extraordinary insights into the lives of individuals all those years ago.

Rosalie tells Jim Al-Khalili about her journey from classics and ancient history to biomedicine, including some of her adventures in Egypt in the 1960s. She talks about some of her most significant research projects, and the 21st Century forensic detective work on the mummy of a young woman which revealed a gruesome murder 3,000 years ago...