Friends do it, strangers do it and so do chimpanzees - and it's not just deeply embedded in our history and culture, it may even be written in our DNA. The humble handshake, it turns out, has a rich and surprising history. In this week's episode palaeoanthropologist Ella Al-Shamahi speaks to science broadcaster Helen Czerski about a funny and fascinating voyage of discovery - from the handshake's origins (at least seven million years ago) all the way to its sudden disappearance in March 2020.
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The Handshake: A Gripping History

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Regularly embroiled in international conflicts – both militarily and diplomatically – and locked in a cycle of protest and heavy government crackdowns on the domestic political front, Iran has rarely been out of the international spotlight over the past decades. The protests in recent years that were initially sparked in resistance to the oppression of women formed the inspiration for writer and historian Arash Azizi's latest book, What Iranians Want: Women, Life, Freedom. The book asks whether a cohesive movement could eventually be formed out of the many voices of dissent in the country to bring about real change. Joining Azizi to discuss it for this episode is the journalist, audio producer and book critic Mythili Rao.
This episode was recorded in early March 2024, prior to the most recent military conflict between Iran and Israel.
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Arash Azizi on Iran's Turbulent Past and its Uncertain Future

For this episode, particle physicist Harry Cliff takes us on a deep dive into some of the universe's most perplexing scientific mysteries. His recent book, Space Oddities, draws on many findings found during his work at the University of Cambridge. Why are stars flying away from us faster than anyone can explain? What are the source of mysterious particles found to hold huge amounts of energy trapped beneath Antarctic ice? What really goes on at the CERN Large Hadron Collider? – another place where Cliff does much of his work. Joining him in conversation for this episode is Alex Wilkins, reporter for New Scientist. 
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Getting Weird with Physics, with Harry Cliff

Alexander Christie-Miller is a former Istanbul correspondent for The Times newspaper, whose writing has also appeared in outlets such as Newsweek, The Atlantic and The White Review. His recent book, To the City: Life and Death Along the Ancient Walls of Istanbul, combines tales drawn from centuries past and also those from the contemporary sociopolitical picture in Istanbul to weave together an expansive narrative that circles around the city like its defensive walls that have stood for a millennium. Joining him in conversation to discuss the book is Hannah Lucinda Smith, Turkey correspondent for The Times and Monocle. She's the author of books including Erdogan Rising, which follows the ascent to power of Turkey's strongman leader, Recep Tayyip Erdogan.
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Istanbul: Crossroads of the World, with Alexander Christie-Miller

This is Part Two of a three-part episode. Britain is in big trouble. The country has dipped into recession, local councils are going bankrupt and trust in our politics has collapsed. Could Labour leader Keir Starter remake Britain after the next election? According to political economist, writer and author, Will Hutton, and political strategist, journalist and co-host of The Rest Is Politics podcast, Alastair Campbell, a recovery is in our own hands. For this Intelligence Squared live event on how to remake Britain, Keir Starmer himself joins Hutton, Campbell and our host, Sonia Sodha, live on stage at London's Union Chapel to discuss the future of British politics and the themes of renewal found within Hutton's book, This Time No Mistakes: How to Remake Britain, and Campbell's book, But What Can I Do? which both look to inspire a new generation of political leaders.
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Keir Starmer, Will Hutton, Alastair Campbell and Sonia Sodha on How to Remake Britain, Part Two

Britain is in big trouble. The country has dipped into recession, local councils are going bankrupt and trust in our politics has collapsed. Could Labour leader Keir Starter remake Britain after the next election? According to political economist, writer and author, Will Hutton, and political strategist, journalist and co-host of The Rest Is Politics podcast, Alastair Campbell, a recovery is in our own hands. For this Intelligence Squared live event on how to remake Britain, Keir Starmer himself joins Hutton, Campbell and our host, Sonia Sodha, live on stage at London's Union Chapel to discuss the future of British politics and the themes of renewal found within Hutton's book, This Time No Mistakes: How to Remake Britain, and Campbell's book, But What Can I Do? which both look to inspire a new generation of political leaders.
We are sponsored by Indeed. Go to Indeed.com/IS for £100 sponsored credit.
This is the first of a three-part discussion. Intelligence Squared Members can listen to all three instalments, including the Members-only Part Three, immediately.
If you'd like to become a Member and get access to all of our longer form interviews and Members-only content, just visit intelligencesquared.com/membership to find out more. 
For £4.99 per month you'll also receive:
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Or Subscribe on Apple for £4.99:
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The Handshake: A Gripping History

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