Welcome to Greenwich Skeptics in the Pub!
Next talk on 14/Sep: “How certain is certain enough?” by Adam Kucharski
Greenwich SitP is currently the only branch of SitP in South East London. The idea is simple: Once a month, we all meet up in a pub to hear a guest speaker and enjoy a drink or three.
Our regular meet-up spot has changed as of October 2025. We’ll now be gathering at The Plume of Feathers (19 Park Vista, SE10 9LZ) on the second Monday of each month, unless otherwise noted. Talks will begin at 7:30pm. Although the talks are free and open to all, we would appreciate a small contribution towards covering speakers’ expenses (suggested donation: £4).
Stay updated on our latest events right here on our website, or connect with us on:
- Meetup: Greenwich Skeptics in the Pub
- Twitter: @greenwichsitp
- Bluesky: @greenwichskeptics.org
- Mastodon: @GreenwichSITP@mastodon.world
- Facebook: Greenwich Skeptics in the Pub
We look forward to seeing you at one of our informal gatherings soon!
Our Next Talk
How certain is certain enough?
Adam Kucharski
Author and Mathematician
14 September 2026 Monday 19:30
The Plume of Feathers
19 Park Vista, Greenwich, SE10 9LZ
What would convince you that something is true? And once you got there, how would you convince others?
Adam Kucharski will discuss the crucial ideas behind his new book, Proof: The Uncertain Science of Certainty, exploring the methods we can use to get closer to what’s really happening – and what happens when these methods fail.
Throughout history, scientific progress has relied on establishing fact from fiction. For millennia, the reasoning went: achieve logical perfection and be rewarded with ultimate, universal truth.
But demonstrating that a new medical treatment works, persuading a jury of someone’s guilt, or deciding whether to trust a self-driving car requires us to weigh up noisy, uncertain evidence.
In an era where truth feels ever more fragmented and information ever more overwhelming, we will delve into how we got here – and where we’re going next.
Adam Kucharski is a mathematician, epidemiologist, and author. He is a professor at the London School of Hygiene & Tropical Medicine, where he has developed new ways to understand and predict global outbreaks, including Ebola, Zika and COVID. He has contributed scientific insights to multiple governments and health agencies, and collaborated on research with organisations including the Premier League and the BBC. In 2023, he was awarded the Adams Prize, one of the most prestigious prizes in UK mathematics, for his work on epidemic analysis.
His popular science articles have appeared in publications including New Scientist, The Times, Financial Times and Wired and he has contributed to several documentaries, including BBC Horizon. He is author of Proof: The Uncertain Science of Certainty, which has been named a 2025 Financial Times and New Scientist Book of the Year. He is a TED Senior Fellow and winner of the 2016 British Science Association Rosalind Franklin Award, and has a PhD in Applied Mathematics from the University of Cambridge.
October 2026
Bad Influence:
How the Internet Hijacked Our Health
Dr Deborah Cohen
12 October 2026 Monday 19:30
The Plume of Feathers
19 Park Vista, Greenwich, SE10 9LZ
You used to see a doctor. Now you go online.
Need to focus? Want to lose weight? Build muscle? Get pregnant? Advice is just a click away. With long waits for treatment and fewer face‑to‑face GP appointments, influencers have stepped into the breach. From doctors promoting untested therapies to celebrities selling solutions, these self-styled experts radiate wellness and guarantee results. Exploring the transformation of a healthcare system driven by online trends, Dr Deborah Cohen reveals the truth behind Ozempic influencers, AI-powered diagnoses, ‘preventative’ screening and Instagram’s favourite wearable tech. Her book, Bad Influence, is about the commodification of health in an age of anxiety and why we can no longer distinguish medicine from marketing.
Dr Deborah Cohen is an award winning medically qualified broadcaster, journalist and editor, who has worked across mainstream and academic print, digital, TV and radio.
Having established the investigations unit at The BMJ, one of the world-leading medical and health policy journals, she specialises in complex investigations combing rigorous data analysis with journalism.
Dr Cohen was recently Science Editor of ITV News and UK and Health Correspondent for BBC Newsnight leading their Covid-19 coverage. With several major investigations for BBC Panorama, Channel 4 Dispatches, ITV Tonight and BBC’s File on Four, Dr Cohen’s work has contributed to major changes in health policy and medical practice. It and has led to questions being asked in parliaments around the world. Dr Cohen is the author of Bad Influence: How the Internet Hijacked Our Health – published in January 2026 – which examines how the internet, commercial incentives and influencer culture are shaping our health.
Her work has also garnered international media coverage and has been the basis of Netflix documentaries and global investigations.
In addition to her experience working at the interface of the mainstream media and academia, Dr Cohen has substantial experience helping experts develop and present their work in a digestible and accessible way.
November 2026
When Should Speech Be a Crime?
Andrew Copson
Humanist UK
9 November 2026 Monday 19:30
The Plume of Feathers
19 Park Vista, Greenwich, SE10 9LZ
In a democratic society, few principles are as cherished—or as fiercely contested—as freedom of expression. However, the line between a protected opinion and a criminal act is often blurred by the heat of modern debate. In this talk, Andrew Copson explores the delicate balance between the right to speak and the right to be protected from harm. He will navigate the vital distinction between legal censorship and social accountability, examining why freedom of speech does not equate to freedom from the consequences of that speech.
Andrew Copson has been the Chief Executive of Humanists UK since 2009 and served as President of Humanists International for a decade. A prolific author and commentator, he has co-written several bestsellers on humanism with Alice Roberts and authored Secularism: A Very Short Introduction. A regular contributor to national press and broadcast media, Andrew has advised numerous government departments and public bodies on secularist and ethical issues. He is a Classics and History graduate of Balliol College, Oxford, and a Fellow of the Royal Society of Arts.
NB: This talk was advertised for a different date. Apologies for the change, and thanks for bearing with us!
December 2026
The Devil’s Advocate: Demons and the Law
Naomi Ryan
Criminal Barrister
14 December 2026 Monday 19:30
The Plume of Feathers
19 Park Vista, Greenwich, SE10 9LZ
The Devil is a figure of fascination. Over the centuries, he has been depicted as a tempting snake, a malicious goat, a tragic fallen angel, a terrifying, cloven footed beast and even a squeaky voiced, saucy South Park character. He has captured the attention of writers, poets, folklorists, historians, philosophers and most obviously, the Catholic Church. But few people know the role that he has played in shaping the law. Satan has played central roles in a whole array of cases. If the allegations are to be believed, Lucifer and his impish minions have led women to commit acts of witchcraft, often involving kissing various orifices. They have possessed people’s minds and sent messages through rock music, tricking them into committing horrible crimes. A demon has even taken physical form to torment and abuse a BBC journalist.
Join barrister and supernatural-enthusiast Naomi Ryan for a look at some truly Luciferian law. Learn about murder cases involving demonic possession and satanic cases of slander. Listen to recordings of demons that were actually played to judges and hear about the lascivious acts of loyalty witches had to show to their Satanic master. But most importantly of all, learn how judges, barristers and juries have engaged with these baffling claims to ensure that in most cases, justice was done to all..
Naomi Ryan is a criminal barrister and lover of all things macabre. After qualifying with an first class undergraduate degree from UCL and a Masters in Law from St Catherine’s College, Oxford, she taught criminal law to undergraduates at St Hilda’s College Oxford and University College London before embarking on her career as a criminal barrister. She both prosecuted and defended before moving to the Civil Service, where she worked for an array of prestigious departments, including the Attorney General’s Office, the Director of Public Prosecutions and the Court of Appeal. She has since moved back to the self-employed bar, where she both prosecutes and defends.
When she isn’t advising legal luminaries, she delivers spirited(!) talks on macabre events in legal history. She is a regular feature at London’s Month of the Dead festival, and can often be found addressing museums and other legal and supernatural organisations on the spooky and scintillating topic of ghost law. Her favourite subjects include ghosts as witnesses, the prosecution of fraudulent mediums and the High Court’s treatment of demon mongooses called Gef.
January 2027
Doodles in the Dark:
An Artist’s Guide to Lucid Dreaming
Dave Green
Artist
11 January 2027 Monday 19:30
The Plume of Feathers
19 Park Vista, Greenwich, SE10 9LZ
Artist Dave Green gives a talk based around his new book Doodles in the Dark: An Artist’s Guide to Lucid Dreaming. Dave draws pictures inside his lucid dreams and recreates the results upon waking up, a practice that’s drawn the interest of neuroscientists and led to peer-reviewed research including a study into precognitive dreams with Skeptics in the Pub’s very own Christopher French. Join Dave on a genre-bending journey through the science, history and philosophy of the dreaming mind all told through his otherworldly dream doodles. He might even give you some tips to learn lucid dreaming yourself.
Dave Green is a London based artist who creates simple line drawings in his lucid dreams which he re-creates upon waking up. Lately he has been experimenting with giving his pen and paper to other people in his dreams to see what they create. His art has been featured in BBC Science Focus and DreamTime magazine. He has lectured about his work at Tate Modern and is the subject of a documentary by The World Science Festival called ‘The Dreaming Pen’. His new book Doodles in the Dark: An Artist’s Guide to Lucid Dreaming is available now.
February 2027
“Purges, Emetics, Bleedings”… and Experience?
On Homeopathy’s Past (and Present) Medical Place
Dr Caitjan Gainty
Writer, Historian of Medicine
8 February 2027 Monday 19:30
The Plume of Feathers
19 Park Vista, Greenwich, SE10 9LZ
In 2018, in response to a legal challenge, the NHS formally discontinued funding homeopathic care and remedies, which surely came as a blow to then one of the largest homeopathic facilities in Europe, the Royal London Hospital for Integrated Medicine or, as it was known between its founding in 1849 and its 2010 name change, the Royal London Homeopathic Hospital. In no small way this move was helped by the work of the physician-scientist Edzard Ernst, whose extensive and intensive scientific scrutiny of complementary and alternative therapies – especially during his near 30 year tenure as the Laing Chair in Complementary Medicine at Exeter – has relegated most homeopathic remedies to the therapeutic scrap heap.
For many of us, neither Ernst’s findings nor the NHS’s defunding of homeopathy are so surprising. After all, from Samuel Hahnemann’s founding of homeopathy in the early 19th century to the present, homeopathy has been not just subject to critique but widely mocked, for the twinned absurdities that characterised its remedies: serial dilution, to the point where only “essence” was left, and a showy, often theatre-worthy choreography of rubbing and shaking required to “activate” it. What is surprising, though, is just how attached we’ve been to homeopathy nevertheless, such that its dislocation as a legitimate medical therapy would come so late and require so much to get it off of the NHS’ books.
What is it we have liked, and judging by its ongoing global popularity, continue to like so much about homeopathy? That’s the question that guides this talk, inspiring both a look back to the 19th century origins of homeopathic practices and their adherents and critics and a look from the vantage point of homeopathy at the rest of medicine’s more-pluralistic-than-we-like-to-think landscape.
Caitjan Gainty is an award-winning writer and a historian of medicine at King’s College London. She has written two books, one on the surprising significance of efficiency – an idea and set of practices borrowed from the factory floor – for early 20th century American medical practice, and the other, titled Healthy Scepticism, on the history and contemporary of medicine written from the vantage point of the hidden doubters and critics in us all. Caitjan is in the midst of researching a new project tentatively titled Unproductive, which offers up a history of our obsession with being productive and the wild things it has made us do and think and believe in its pursuit.
March 2027
The Unexpected Maths of Juggling
Dr Colin Wright
8 March 2027 Monday 19:30
The Plume of Feathers
19 Park Vista, Greenwich, SE10 9LZ
How can you describe a juggling trick? In the mid-1980s several groups around the world were exploring the idea, and a notation developed. Then they found that when they had the courage to leave gaps, patterns emerged. But gaps in patterns need to be filled!! And thus were new and unknown juggling tricks discovered. In this talk we’ll see how the notation can be developed, and finish with a potentially new juggling pattern for the speaker to attempt.
Colin Wright completed his PhD in 1990, has worked in industry, and has appeared on Radio, TV, in books, and on the internet. He is a non-exec Director of Research and Development for a Marine Radar Company that produces equipment to do the maritime equivalent of Air Traffic Control.
Colin has done research in mathematics, data science, and computer science, but his primary activity is now giving talks and workshops on the unexpected emergence of mathematics. In that role he is a full-time freelance provider of Outreach and Enhancement, giving shows, workshops, and masterclasses in mathematics all over the world.
April 2027
The Levitating Hamster and the Salmon of Doubt
Richard Marshall
Science Communicator
12 April 2027 Monday 19:30
The Plume of Feathers
19 Park Vista, Greenwich, SE10 9LZ
Animal studies contribute hugely to science but, with few exceptions, the animals themselves are rarely the stars of the show. To set this right, science communicator and host of Science in the Pub, Richard Marshall, has collected some of the funniest, quirkiest, and most bizarre stories of animals in science for a talk which explores: Can hamsters levitate? Do salmon emote? Did herring revive Doctor Who? And just why are there so many cats in science?
Richard Marshall is on a mission to make science accessible, enjoyable and understandable. He’s been hosting Science in the Pub for nearly a decade, and in 2025 became presenter-producer of a radio show imaginatively titled The Science Show. Broadcasting on Resonance 104.4 and streaming on Mixcloud, as a podcast it regularly beats Neil deGrasse Tyson to the Number 1 spot. In 2024 he staged a sell-out one man show of narrative comedy called The Levitating Hamster and Other True Stories from Science. This talk is not that show — he’s just not very good at coming up with new titles.