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In Our Time

Relativity

Duration: 42 minutes

First broadcast: on BBC Radio 4 FMLatest broadcast: on BBC Radio 4 LW

Available for over a year

Melvyn Bragg and his guests discuss Einstein's theory of relativity, a hypothetical framework that transformed our understanding of the universe. Show more

Contributors

Presenter:
Melvyn Bragg
Interviewed Guest:
Martin Rees
Interviewed Guest:
Roger Penrose
Interviewed Guest:
Ruth Gregory
Producer:
Thomas Morris

In Our Time

Perpetual Motion

Duration: 43 minutes

First broadcast: on BBC Radio 4 FMLatest broadcast: on BBC Radio 4 LW

Available for over a year

Melvyn Bragg and guests discuss how the laws of thermodynamics put a stop to the idea perpetual motion. Show more

Contributors

Presenter:
Melvyn Bragg
Interviewed Guest:
Ruth Gregory
Interviewed Guest:
Frank Close
Interviewed Guest:
Steven Bramwell