Peter Leonard

Horizon interviews some experts and looks at the matters which can change our lives in the future, like: climate change, the future of transport, energy production, gene therapy, artificial intelligence, among other things.

Scientists genuinely don't know what most of our universe is made of. The atoms we're made from only make up four per cent. The rest is dark matter and dark energy (for 'dark', read 'don't know'). The Large Hadron Collider at CERN has been upgraded. When it's switched on in March 2015, its collisions will have twice the energy they did before. The hope is that scientists will discover the identity of dark matter in the debris. The stakes are high - because if dark matter fails to show itself, it might mean that physics itself needs a rethink.

Having left the hollers of Kentucky 15 years ago, Raylan Givens is now based in Miami, balancing life as a marshal and part-time father of a 15-year-old girl. A chance encounter on a Florida highway sends him to Detroit and he crosses paths with Clement Mansell, aka The Oklahoma Wildman, a violent sociopath who’s already slipped through the fingers of Detroit’s finest once and wants to do so again.

Based on his book, American writer Stewart Brand takes a look at the life history of buildings - how they're shaped by their architects, and how they're further shaped by their inhabitants.

In the ultimate clash of the titans, the giants of prehistory engage in mortal combat.