Significant international thinkers deliver the BBC's flagship annual lecture series.
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Last Sunday 12:06 GMT
BBC World Service
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Have Einstein’s gravitational waves finally been observed?
Jim Al-Khalili invites you to brush up on your scientific icebreakers.
'I want to encourage people to explore the known and the, as yet, unknown'.
WARNING: You might need to be a scientist to find these funny.
His life, career and influences. Image: NASA
What's in the mind of the world’s most famous physicist?
Revelations that have changed the way we see the world. Image: Alamy
Reith lecturers make sense of the world and beyond.