Professor Jim Al-Khalili investigates the amazing science of gravity. A fundamental force of nature, gravity shapes our entire universe. It sculpts galaxies and warps space and time. But gravity’s strange powers also affect our daily lives in the most unexpected ways. This is a story with surprises in store for Jim himself. In telling the story of gravity, his own understanding of the nature of reality comes to be challenged. Finally, Jim discovers that, despite incredible progress, gravity still has many secrets to unveil.

Fancisco Pizarro hoped to find great riches in the land of the Inca when he set off on his third voyage to the new world in 1527. Travel back in time with Michael Wood and learn how Pizarro ransomed the life of a king for a room full of gold and silver. Trough letter and drawings from the 16th century and film from modern-day south America, discover this remarkable story of greed, faith, dishonor and valor.

We all agree lying is shameful. Yet we still deliberately deceive each other constantly. Are our brains wired for lying from a young age? The brains of pathological liars may provide insights. Will technology make it easier for us to be dishonest, or could it someday instantly reveal someone is lying? Perhaps we are deceitful because our limited senses prevent us from seeing the real truth. Scientists say our own memories deceive us, and have managed to implant false memories. Other scientists look for ultimate truth in the subatomic world … only to end up turning reality on its head.

Technology is evolving from an external tool we wield when needed to an always-there presence that is with us, on us, even inside of us. As we become more and more wired, are we becoming digital devices ourselves? In this episode meet a Swedish mom who implanted an RFID chip as a lifestyle choice; a filmmaker who lost his eye in a gun accident and replaced it with a camera; and the so-called "world most connected man," who uses between 300-700 tracking and life logging systems to monitor every aspect of his life.

Having explained the science behind global warming, and addressed the arguments of the climate change sceptics earlier in the series, Dr Iain Stewart concludes the series by looking at the biggest challenge now facing climate scientists - Just how can they predict exactly what changes global warming will bring?
It's a journey that takes him from early attempts to model the climate system with dishpans, to supercomputers, and to the frontline of climate research today: Greenland. Most worryingly he discovers that scientists are becoming increasingly concerned that their models are actually underestimating the speed of changes already underway.

How does a chef trained in the finest kitchens of France translate his haute cuisine to fast food? Ludo’s obsession with a perfectly cooked bird can be traced back to France, where he learned to roast chicken.
His love for the American classic was solidified in 1996 when he arrived in LA and ate at KFC for the first time. “It was the same sensation,” he’s said, the crunchy skin and juicy flesh, and the gap between his two worlds was bridged. In this episode we learn how a Frenchman became famous for a truly American dish.