Thony Christie has a blog called the Renaissance Mathematicus. It covers the history of science and is one of the wonders of the blogging world. I asked him to talk to me about the history of astronomy and he delivered a masterclass.

David Rooney is the author of About Time: A History of Civilisation in Twelve Clocks. He talks about clocks (in the widest sense of the word - sundials, waterclocks, orbiting satellites and more) and about how time is used to demonstrate and exert power. He is quite simply a delightful speaker who knows his subject inside and out and knows how to get you to share his enthusiasm. Such a pleasure!

Freddie, Abe and I talk about movies. Three blokes talking about feminism in movies. Well of course. But much more besides. Films discussed include Mad Max Fury Road, Once Upon a Time in Hollywood, that Ghostbusters remake . . .

I asked everyone to recommend one hidden gem. Freddie delivered his one, Abe crammed in three and I cheated and came up with five:

Freddie
S.F. W.

Abe
The Man Who Wasn't There
Advise & Consent
Talk Radio

Russell
Red Rock West
Ripley's Game
A Stranger of Mine
One Cut of the Dead
Headhunters

Julian Sancton is a wonderful guide to the Belgian expedition to Antartica in 1898.  The crew of the Belgica included Roald Amundsen and Frederick Cook who went on to become among the most famous explorers of their time. Julian's book is a classic of the genre. Check out on Amazon in the UK and in the US.

Kenji Tierney is a wonderfully engaging speaker. Starting with memories of being introduced by his grandmother to sumo by way of watching TV with her he gives a wonderfully learned and fascinating talk on sumo and its development. The story of how the Japanese tried to impress Commodore Perry with a sumo wrestling exhibition and he responded by putting on a minstrel show is just one of many fascinating stories. If sumo has always left you a bit baffled this is a thoroughly entertaining 'deep dive'.

Robin Gaster's book Behemoth, Amazon Rising: Power and Seduction in the Age of Amazon is available to buy on, naturally, Amazon. If you want to understand where Amazon came from, why it is so successful and why it needs to be tamed this is a great place to go. I spoke to Robin on my podcast. I still can't make up my mind. It seems I buy half my stuff from Amazon - but Robin makes a good case for why that is the problem . . .

Emiko Ohnuki-Tierney is a professor of anthropology at the University of Wisconsin. Here she recalls her life as a young girl in Kobe during World War II and we talk also about the kamikaze pilots of that period. Her books Kamikaze Diaries and Kamikaze, Cherry Blossoms and Nationalisms have been highly influential in explaining how the highly educated young men were led to their fate.

Roger Crowley tells the story of how Portugal built its empire in the Indian ocean from 1498. The Portuguese were there to trade but also as zealots and crusaders. The story is one of discovery, courage, violence and often unspeakable cruelty. It is astonishing to learn how one of Europe's smallest and poorest countries could undertake such a project.

Roger's book Conquerors: How Portugal Forged the First Global Empire was hugely popular with critics and with lovers of deeply researched but highly readable narrative history.

Mike Dash wrote the definitive book about the Batavia and its wreck near the coast of Australia in 1629. We talked about the events leading up to the wreck and the bloody reign of terror and murders that followed.

Mike's blog A Blast from the Past is also an absolute goldmine for people interested in history.

I'd also highly recommend Gareth Harney's Twitter thread about the events and one of the treasures from the ancient world that the Batavia was carrying. Absolutely fascinating and some beautiful images (one of which I used for this episode's artwork).

An absolute joy to spend an hour and a half with history professors David Abulafia and Bret Devereaux. We started with the founding of Alexandria and travelled back and forth in time and all around the Mediterranean. The starting point for the discussion was David's magnificent book the Great Sea but Bret had plenty to add. (Check out his blog here).