Claudia de Rham has rather an unusual relationship with gravity.

While she has spent her career exploring its fundamental nature, much of her free time has involved trying to defy it - from scuba diving in the Indian Ocean to piloting small aircraft over the Canadian waterfalls. Her ultimate ambition was to escape gravity’s clutches altogether and become an astronaut, a dream that was snatched away by an unlikely twist of fate.

However, Claudia has no regrets - and says defying gravity for much of her life has helped her to truly understand it.

As Professor of theoretical physics at Imperial College London, she now grapples with deep mathematics, where the fields of particle physics, gravity and cosmology intersect, on a quest to understand how the universe really works. She is a pioneer of the theory of massive gravity, a theory which could take us beyond even Einstein’s theory of relativity and shed light on why the universe is expanding at an ever-increasing rate.

Presented by Jim Al-Khalili

When you think of Artificial Intelligence, does it inspire confidence, or concern?

Although it's now generally accepted that this technology will play a major role in our future, a lot of conversations around AI and machine learning come back to the argument over us losing control and robots taking over.

Happily, Neil Lawrence has a more optimistic view of the power of AI, and how we might navigate the potential pitfalls. Neil is the DeepMind Professor of Machine Learning at the University of Cambridge, and over the course of his career has been involved in deploying AI and machine learning in both academic and commercial scenarios, with a stint at Amazon as well as working across fields as varied as movie animation, Formula 1 strategy, and medical research.

Speaking with Professor Jim Al-Khalili, Neil says ultimately his efforts are all about making a difference to our everyday lives - and that we need to learn how to embrace AI, albeit with a healthy dollop of scepticism; not least when it comes to how our data is used, and the power of 'the digital oligarchy'...

Presented by Jim Al-Khalili

A frozen, white world at the far-reaches of the globe, where you're surrounded by snow and silence, might sound rather appealing. Factor in temperatures that drop to -57°C and a few of us might be put off - but for glaciologist Liz Morris, that's very much her happy place.

Liz is an Emeritus Associate at the University of Cambridge’s Scott Polar Research Institute, and was among the first British women scientists to work on the planet’s coldest continent, Antarctica. Over the course of her career, Liz has gathered vital data on polar ice sheets and how they’re affected by climate change. She's also made numerous research trips across the Greenland Ice Shelf, and has a glacier named after her in Antarctica.

In conversation with Professor Jim Al-Khalili, Liz discusses her fascination with glaciers and ice - and explains her unwavering determination to break into what was once a heavily male-dominated field.

Presented by Jim Al-Khalili

Welcome to a world where medicine meets politics: a space that brings together scientific research, government wrangling, public push-back and healthcare conspiracies…

Dr Anthony Fauci was the Director of America’s National Institute of Allergy and Infectious Diseases for nearly four decades, during which time he not only helped study, treat and prevent viruses such as HIV/AIDS and Covid-19; he also advised seven US Presidents, from Ronald Regan through to Joe Biden.

Along the way, Tony Fauci's picked up a public profile and taken a fair amount of flack; not least because of his complicated relationship with President Donald Trump. But he's also made great strides in medical research and policy, from working with activists who initially challenged him on the government response to HIV/AIDS - to spearheading the USA's PEPFAR project to share vital medication with developing nations.

In a candid conversation with Professor Jim Al-Khalili, Tony discusses his childhood in Brooklyn, the dark early days of the HIV/AIDS epidemic and lessons from the Covid-19.

Presented by Jim Al-Khalili

Investigating an insect known for eating its prey alive – including, at times, its own species - the praying mantis! With bulging eyes and a triangular head, this predator uses it specially adapted front legs to trap its prey.

Able to predate animals of a size much larger than themselves, including birds, lizards and even fish, presenter Adam Hart hears about their cultural significance to human populations all around the world, as well as addressing their reputation for sexual cannibalism. We also hear about their biomaterial qualities and potential importance in agriculture, and also look into a parasitic relationship the praying mantis has with a worm in South America which has given them the name ‘the mother of snakes’.

Contributors:

Dr. Julio Rivera, entomologist and researcher at the Université de Montréal in Canada and research associate at the Montréal Insectarium.

Dr. Bianca Greyvenstein, postdoctoral fellow at North-West University in Potchefstroom and an expert in the praying mantises of South Africa.

Presenter: Professor Adam Hart

(Photo: Praying Mantis, Credit: Paul Starosta via Getty Images)

Investigating an elusive big cat known for its excellent tree climbing abilities - the leopard! This master of camouflage is found from the south of Africa to the far east of Asia – a spotted predator that stalks and ambushes its prey!

Presenter Adam Hart will investigate their relationships with tigers and lions, as well as learning about a recent discovery that leopards each have their own unique roar. He’ll also discuss the future of the Arabian leopard and the potential for a reintroduction to Saudi Arabia, and find out about the role of synthetic fur capes known as ‘Heritage Furs’ in leopard conservation.

Contributors:

Dr. Gareth Mann, who is based in South Africa, is Leopard Program Director for Panthera, the global wild cat conservation organisation.

Dr. Charlotte Searle, postdoctoral researcher and conservationist based in Tanzania, who is associated with the Wildlife Conservation Research Unit at the University of Oxford.

Presenter: Professor Adam Hart

Photo: Leopard in tree

On this episode of The Evidence, Claudia Hammond discusses all things hydration with a panel of experts. Where do our hydration guidelines come from? How do we determine the perfect amount of water we should drink? What are the issues with water access that people and populations face aroud the globe? And how will climate change affect the amount of water we need, and our access to it. In front of a live audience at the Wellcome Collection in London, Claudia discusses these questions and more with Neil Turner, nephrologist and professor emeritus at Edinburhg University, Yael Velleman, Director of Policy and Innovation at Unlimit Health, working at the intersection of water access, sanitation, and disease; and Anthony Acciavatti, an associate professor at Yale Architecture School and creator of the exhibtion Groundwater Earth: The World Before and After The Tubewell.

Named after a beast from Greek mythology, the harpy eagle is widely considered to be the most powerful bird of prey due to its strong legs and huge talons. With a crown of feathers atop its head, and known for eating monkeys and sloths, this regal-looking raptor dominates the rainforest canopies across much of South and Central America.

Presenter Adam Hart looks into the folklore and cultural importance of these imposing birds, as well as finding out why these apex predators of the treetops are having to increasingly search for ground-dwelling prey such as armadillos. He also hears how harpy eagle researchers were the pioneers for biological applications of GPS in order to study and track these animals in the dense rainforest.

Contributors:

Dr. Helena Aguiar-Silva, biologist and associate research scientist at the National Institute for Amazonian Research and a member of Projeto Harpia Brasil.

Dr. Eduardo Alvarez founder of a non-profit organisation called EarthMatters.org, to concentrate on the study and conservation of harpy eagles and to preserve their rainforest habitat.

Presenter: Professor Adam Hart

Image: Harpy eagle and nest with chick

Investigating the black-and-white apex predator of the sea – the killer whale! Able to predate even great white sharks, this marine mammal is the largest member of the dolphin family. From tropical seas, to the Arctic and Antarctic, killer whales (or orcas) are found across the world. Living in family groups and often led by a post-menopausal matriarch, killer whales have passed on their hunting methods, which vary depending on which prey they specialise in hunting, through the generations.

Presenter Adam Hart finds out about the killer whales incredible social behaviours (such as wearing salmon as hats) and hears how a dog is helping killer whale researchers access a gold mine of information about this predator. He also hears what challenges killer whale populations are facing and why killer whales may be attacking boats off the coast of the Iberian peninsula.

Contributors:

Dr. Leigh Hickmott, whale biologist and conservationist, who is an expert on Pack Ice killer whales, and whose research uses them as indicators to assess human disturbance of marine habitats.

Dr. Deborah Giles, who is an expert on Southern Resident killer whales, based with the SeaDoc Society, a program of the Karen C. Drayer Wildlife Health Center at the UC Davis School of Veterinary Medicine.

Presenter: Professor Adam Hart

(Photo: Killer Whales, Credit: Serge MELESAN via Getty Images)

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