CrowdScience listener Po wants to know whether AI could one day replace all human jobs. And while he requests that CrowdScience continues to be hosted by people, it made presenters Caroline Steel and Anand Jagatia wonder – could an AI really present this show?

To find out more about how AI models work and what they’re capable of, Caroline Steel speaks to AI journalist Alex Hern from The Economist. She creates an AI version of herself with Nicky Birch, Innovation Lead for the BBC’s generative AI program, and hears how the BBC is attempting to navigate the ethical use of this new technology.

Anand Jagatia speaks to phonetician Prof James Kirby about how synthetic AI voices have become so convincing, as well as why they still sound slightly unnatural. And Anand and Caroline ponder whether there could ever be a place for AI presenters on the airwaves.

Presenters: Caroline Steel and Anand Jagatia

Producer: Anand Jagatia

Additional production: Lorna Stewart

Editor: Ben Motley

(Photo: Mirror image of presenter Caroline holding microphone Credit: BBC)

CrowdScience listener Doug has been experimenting with holding his wireless garage key to his chin. Why? Because he's testing a strange trick of physics. The range of a key can apparently double when held against your head rather just being held in your hand. Could this really be true, and if so why? Presenter Caroline Steel goes on a wavy journey of self-experimentation with antennas. She follows the story of Doug as he wanders the streets of Calgary in Alberta, Canada testing the key on his head from different distances and even testing it on his dog Maura’s head. To understand the physics behind all this, Caroline meets Dr Lina Mohjazi, Lecturer of Autonomous Systems and Connectivity at the University of Glasgow and Guy Vandenbosch, Professor of Electromagnetic Radiation at KU Leuven University in Leuven, Belgium. Presenter: Caroline Steel Producer: Tom Bonnett Editor: Ben Motley

(Photo: Hand holding a car key remote in front of a red car - stock photo Credit: vadishzainer via Getty Images)

CrowdScience listener Kassy in India wants to know if there’s any science to support the practice of ‘manifesting’ – the idea that you can make your wishes come true just by writing down your goals and sending your dreams out to the universe. Is it just a wacky belief or can it be backed up by research?

Caroline Steel looks at the evidence to see if manifesting works. She talks to researcher Lucas Dixon in Australia, who has found that people who believe in manifesting are more likely to take risky financial decisions or end up bankrupt.

She meets neuroscientist Sabina Brennan in Ireland who argues that psychology has already proven that our thoughts and beliefs shape our reality, through cognitive behavioural therapy for example. So there is evidence to show that some of the techniques in manifesting can work.

Caroline also talks to psychologist Gabriele Oettingen in the US, whose research has demonstrated that just thinking about our wishes actually decreases our energy and makes it less likely that we’ll achieve our goals. She’s come up with her own method for increasing the likelihood of success.

And Caroline tries out a manifesting technique for herself. Can it help her realise her dreams?

Presenter: Caroline Steel Producer: Jo Glanville

Editor: Ben Motley

(Photo: Enthusiastic brunette girl celebrating- stock photo Credit: Mix and Match Studio / 500px via Getty Images)

CrowdScience listener Ndanusa in Ghana, is gazing up at the stars, and wondering. Big philosophical questions, like… what keeps our universe in balance?

From our perspective here on earth, the universe seems like a vast, harmonious system, perpetuating eternally without change. But Ndanusa knows a thing or two about the stars, and he knows that they use up hydrogen as they burn, and release helium. And he’s wondering, is there something out there which does the opposite? Something that uses up helium, and produces hydrogen, to keep the universe in perfect, chemical equilibrium?

His question makes sense! Here on earth for example, animals use up oxygen and produce carbon dioxide, and plants do the opposite. A perfect cycle of production and consumption which (at least in theory), keeps our planet in perfect balance. Could the same kind of system be in place in the wider expanse of the universe?

His intriguing question leads presenter Alex Lathbridge on a journey into the blackness of deep space, the ancient origins of our universe, and the complex physics of the stars. He pops into the Ghana Radio Astronomy Observatory, just outside Accra, where astrophysicist Dr Proven Adzri helps him peer into the earliest few seconds of our universe, and find out what set the stars burning. And at Kwame Nkrumah University of Science and Technology, Dr Linus Labik talks him through what’s going on at the atomic level. And in the deep blackness of the night, up above the tree canopy of Kakum National Park, he takes a peek at the stars for himself. Local guides Chris and Kwabena explain how much meaning there is behind the stars in the night sky.

Presenter: Alex Lathbridge

Producer: Emily Knight

Editor: Ben Motley

(Photo: Large orange and purple exploding orb - stock photo Credit: Soubrette via Getty Images)