1/8 Discover the secrets behind the bird-killing solar death ray.
Watch from start
Global study estimates there are 3 trillion trees on Earth (R)
BBC World Service
Tracey Logan investigates the El Nino warnings and the search for the Higgs boson. (R)
BBC Radio 4 FM
9/10 In the jungles of Peru, the world's biggest otters must fight caiman to save their cubs. (R)
17/19 Do multiple universes exist? And if so, which one are we actually in? (R)
BBC Two except Scotland
1/3 Dedicated single parents go to extreme lengths to see their babies through to adulthood. (R)
With the 2015 pilot badger cull confirmed as being underway, what lessons for policing?
BBC Radio 4