How did Einstein's theory of general relativity improve on Newton's 17th century theory of gravity? We give a simple explanation of Einstein's general theory of relativity and show how well it does in explaining many unusual features where Newton's theory fails. Expanding universes, black holes, gravitational lenses and gravitational redshifts are predictions of Einstein's theory. We learn why Einstein's theory is better confirmed than any other piece of human knowledge.

The transcript and downloadable versions of the lecture are available from the Gresham College website:

Gresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. There is currently nearly 1,500 lectures free to access or download from the website.

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