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Professor Sarah Harper on how population change is remodelling societies.
Jim Al-Khalili talks to Professor Sarah Harper about societal ageing and falling fertility

Sarah Blaffer Hrdy on human evolution and parenthood
Jim Al-Khalili discusses monkey infanticide and human parenting with Sarah Hrdy.

Edward Witten on 'the theory of everything'
Physicist Edward Witten on M-Theory, the leading contender for a 'theory of everything'.

Alex Antonelli on learning from nature's biodiversity to adapt to climate change
Jim Al-Khalili meets the Kew Gardens' director using bio-geography to protect biodiversity

Paul Murdin on the first ever identification of a black hole
Paul Murdin shares his story of the first identification of a black hole, Cygnus X-1.

Bahija Jallal on the biotech revolution in cancer therapies
Bahija Jallal on the biotech revolution in cancer therapies.

Sir Colin Humphreys on electron microscopes, and the thinnest material in the world
Sir Colin Humphreys on LEDs, electron microscopes, and the thinnest material in the world

Chris Barratt on head-banging sperm and a future male contraceptive pill
Professor Chris Barratt discusses breaking new ground in male fertility research.

Gideon Henderson on climate ‘clocks’ and dating ice ages
Jim Al-Khalili hears how study of the past climate can help us understand our future.

Deborah Greaves on wave power and offshore renewable energy
Jim Al-Khalili speaks to Deborah Greaves about wave energy and her love of the sea