27/30 Heather Couper looks at research that shows stars are like controlled nuclear explosions.
BBC Radio 4 Extra
Google reverses its threat to bloggers over sexually explicit material
BBC World Service
Janey Godley talks to Joe Tree, who takes a single photo every day and posts it online. (R)
BBC Radio Scotland
The development of TB-resistant cows in China and the challenge of sexing chicks.
BBC Radio 4
John Aitchison presents the dunnock. (R)
What would Wordsworth have made of modern Greens? Prof James Woudhuysen investigates.
Cyfle i glywed rhai o bigion 'Galwad Cynnar' eto.
BBC Radio Cymru
28/30 How the use of infrared telescopes increased our understanding of distant planets.
Commercial surrogacy in India and beyond, plus new kinds of money. With Laurie Taylor.
Tom Heap goes in search of the hybrid beefalo, which is damaging the Grand Canyon. (R)