This lecture confronts the worldwide phenomenon of the persecution of suspected witches, now a serious, contemporary problem condemned by the UN in 2021.

It will show what has been unusual about Europe in this global pattern, and why the notorious early modern witch hunts there commenced and ended.

This lecture was recorded by Ronald Hutton on 5th June 2024 at Barnard's Inn Hall, London

The transcript of the lecture is available from the Gresham College website:
https://www.gresham.ac.uk/watch-now/witches-europe

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/

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The idea of proof is fundamental to mathematics. We could argue that science consists of testable theories, and therefore that it is about what can be disproved, not what can be proved. In law, the test is “beyond reasonable doubt”.

Famous conjectures in mathematics have been tested by computers for trillions of numbers – but we still call them conjectures.

In this lecture we’ll talk about what mathematicians mean by proof, and I’ll show you some of my favourites.

This lecture was recorded by Sarah Hart on 4th June 2024 at Barnard's Inn Hall, London

The transcript of the lecture is available from the Gresham College website:
https://www.gresham.ac.uk/watch-now/mathematician-proof

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/

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Socrates sought to test the expertise of everyone around him: the bombastic know-it-alls, the bashful youths, the confident generals, those (including the enslaved) with unsuspected mathematical competence, the workaday artisans. Aristotle later explored the ways in which expert claims can be made credible to popular judgement.

This lecture considers the role of experts in contributing to public debate in a democracy, bringing Aristotle's work on rhetoric to bear on norms for expert communication and public debate.

This lecture was recorded by Melissa Lane on 30th May 2024 at Barnard's Inn Hall, London

The transcript of the lecture is available from the Gresham College website:
https://www.gresham.ac.uk/watch-now/experts-politics

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/

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The final lecture in the series returns to the theme of how insight is derived from observations, considering the cosmic microwave background.

This oldest light in the Universe, emitted just 400,000 years after the Big Bang, contains the seeds of the structures we see around us, and tells us about conditions at the Universe's beginning.

It will also consider how measurements of the Universe's expansion, made using the CMB, are leading to unexpected results, creating tension in modern cosmology.

This lecture was recorded by Chris Lintott on 29th May 2024 at Conway Hall, London

The transcript of the lecture is available from the Gresham College website:
https://www.gresham.ac.uk/watch-now/first-light

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/

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This lecture traces the history of race and disability law in the English education system. It examines the impact of discriminatory policies on Black children, children of colour, and disabled children, and how narratives around race and disability have changed.

The lecture questions why inequality persists and explores possible solutions.

This lecture was recorded by Leslie Thomas KC on 23rd May 2024 at Barnard's Inn Hall, London

The transcript of the lecture is available from the Gresham College website:
https://www.gresham.ac.uk/watch-now/education-law

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/

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Logarithms were perhaps once thought of as just an old-fashioned way to do sums on slide rules. But they underpin much of modern life, from modelling the COVID pandemic to Claude Shannon’s mathematical theory of information (which makes mobile phones a reality) and making sense of Cristiano Ronaldo’s crazy Instagram follower numbers.

This lecture will explore the basics and history of logarithms, and then show how they are a natural way to represent many models and datasets.

This lecture was recorded by Oliver Johnson on 22nd May 2024 at Barnard's Inn Hall, London

The transcript of the lecture is available from the Gresham College website:
https://www.gresham.ac.uk/watch-now/logarithms

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/

Website: https://gresham.ac.uk
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Eventually, net zero needs to include everyone: for emissions to continue in half the world while the other half mops them up is both unsustainable and unfair. But this does not mean every country should reach net zero at the same time.

Historical emitters like the UK should aim for net zero before the world as a whole, but a “staggered net zero” also carries risks for developing countries, lest they are left stranded in the race to a sustainable future.

This lecture was recorded by Myles Allen on 21st May 2024 at Barnard's Inn Hall, London

The transcript of the lecture is available from the Gresham College website:
https://www.gresham.ac.uk/watch-now/inclusive-net-zero

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/

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In every financial transaction, one side has more information than the other. For example, when someone buys a used car, the seller will know better than the buyer whether the car is a plum or a lemon. Does more information leave you better off?

One of the fascinating ideas behind the concept of asymmetric information is that more information can lead to you being actually worse off.

This lecture was recorded by Raghavendra Rau on 20th May 2024 at Barnard's Inn Hall, London

The transcript of the lecture is available from the Gresham College website:
https://www.gresham.ac.uk/watch-now/asymmetric-information

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/

Website: https://gresham.ac.uk
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