Susie, a hen harrier whose chicks were killed, is the guest on this episode. They discuss the illegal killing of birds of prey on grouse moors and why it is difficult to solve these crimes. The episode explores the persecution of birds of prey, the impact on conservation, and the personal costs of campaigning on this issue. It also touches on the insults, harassment, and safety concerns faced by activists.

In this episode from March 2023, Ian Sample hears from Scotland’s Astronomer Royal, Prof Catherine Heymans, about her experience of long Covid and how it has affected her life. He also speaks to Prof Danny Altmann, an immunologist at Imperial College London, about the scientific understanding of the condition, and whether we’re any closer to a treatment. Help support our independent journalism at theguardian.com/sciencepod

Installing artificial grass is becoming an increasingly popular way to achieve a neat, green lawn without much effort. But with environmental and potential health costs associated with plastic turf, many campaigners and gardeners would like to see it banned. In this episode from April 2023, Madeleine Finlay speaks to Guardian feature writer Sam Wollaston and urban ecologist Prof Rob Francis about why people go for artificial grass, its environmental impact, and whether it’s time we rid ourselves of the idea of the perfect lawn altogether. Help support our independent journalism at theguardian.com/sciencepod

The film Everything Everywhere All at Once won the 2023 Academy Award for Best Picture. In this episode from March 2023, just before the Oscars, Ian Sample spoke to the theoretical physicist and philosopher Sean Carroll about why we seem to be drawn to the idea of multiple worlds, and what the science says about how the multiverse might actually work. Help support our independent journalism at theguardian.com/sciencepod

As the 10th series of the ITV show finishes, viewers may have noticed the perfectly straight, white teeth of the contestants. But are there risks associated with achieving a flawless smile? In this episode from January 2023, Madeleine Finlay speaks to dentist Paul Woodhouse about some of the dangers of dental tourism. Help support our independent journalism at theguardian.com/sciencepod

Plutonium from nuclear weapons, industrial waste, and human activity more broadly have left such a mark on the Earth that a new epoch called the Anthropocene has been proposed. Scientists are debating the specific geological site to define this epoch, with the frontrunner being an unassuming lake in Canada: Crawford Lake. What is it about this spot that holds the secrets to this period of history? From hydrogen bombs to hens’ bones, how do we define the Anthropocene, the beginning of the human era on Earth? Ian Sample asks Damian Carrington. Help support our independent journalism at theguardian.com/sciencepod

The thing about doppelgangers is that despite looking almost identical, they aren’t biologically related. So, what makes them appear so similar? How do totally different people end up with the same face? And, can studying doppelgangers tell us anything about the age-old question of nature v nurture? Madeleine Finlay speaks to Dr Manel Esteller to find out. Help support our independent journalism at theguardian.com/sciencepod

As record temperatures spread across the world, Ian Sample sets out to understand what heat does to our bodies and what we can do to mitigate it without causing more damage to the environment. He visits Prof Lewis Halsey’s team at the University of Roehampton and learns first-hand about the body’s response to heat. He also hears from scientists Prof Jean Palutikof and Dr Aaron Bach about how we can adapt buildings and working conditions in a changing climate.. Help support our independent journalism at theguardian.com/sciencepod

As the International Seabed Authority gathers in Jamaica to thrash out regulations for mining the deep sea, Chris Michael of the Guardian’s Seascape team gives Ian Sample the background to this highly contested decision. Ian also hears from the marine biologist Dr Diva Amon about why some scientists are sounding the alarm. Help support our independent journalism at theguardian.com/sciencepod

Twenty-five years ago in a German bar, neuroscientist Christof Koch bet philosopher David Chalmers that we’d understand the neural basis for consciousness by 2023. Last month, the winner of the bet received a case of wine. Ian Sample talks to Christof and David about why they made the bet, who won, and where we are now in our understanding of this most fundamental aspect of existence.. Help support our independent journalism at theguardian.com/sciencepod