Travel to the South Pole to discover the inside story of the greatest scientific quest of our time. In March 2014, a team of astronomers stunned the scientific world when they announced that their BICEP2 telescope at the South Pole had possibly detected a signal of 'gravitational waves' from the early universe. This is the inside story of the hunt for gravitational waves from the beginning of time. How the BICEP2 team came close to making one of the greatest discoveries of the century – and what happened when it all began to unravel...

West Perrine, Florida is a suburban ghetto in Southwest Miami. Over 63% of its residents are African-American and the unemployment rate is three times higher than the national rate. Violent crimes occur on a daily basis in this neighborhood of less than two square miles, where much of its adult male population winds up dead or in prison before their 30th birthday. But there is hope in the hood... Dhafir 'Dada 5000' Harris has built a ring in his momma's backyard and transforms himself into the Don King of illegal backyard fights in Perrine". Dada 5000 (6'3", 270lbs., bench presses 670lbs) grew up blocks away from Perrine's MMA sensation, Kimbo Slice, and spent a year traveling the world as Kimbo's bodyguard. When Kimbo's manager buried video of Dada's spectacular backyard fight debut, for fear of Dada overshadowing his rising superstar, Dada leaves Kimbo's crew and makes a life-changing decisión. In his ring there is no doctors, no ambulance. Just two men in a 12'x12' ring battling in a savage bare-knuckle fight to the finish. Dada's gladiators give everything in the the backyard to feed their families and to try to fight their way out of hood. Meanwhile Dada returns to the ring, is discovered by professional scouts and gets his shot at turning pro in the octagon at the Hard Rock Hotel and Casino.

The Celts - one of the world's most mysterious ancient people. In Britain and Ireland, we are never far from our Celtic past but in this series Prof. Alice Roberts and archaeologist Neil Oliver travel much further afield, discovering the origins and beliefs of these Iron Age people in artefacts and human remains right across Europe, from Turkey to Portugal. What emerges is not a wild people on the western fringes of Europe, but a highly sophisticated tribal culture that influenced vast areas of the ancient world - and even Rome". Rich with vivid drama reconstruction, we recreate this pivotal time and meet some of our most famous ancient leaders - from Queen Boudicca to Julius Caesar - and relive the battles they fought for the heart and soul of Europe. Alice and Neil discover that these key battles between the Celts and the Romans over the best part of 500 years constituted a fight for two very different forms of civilisation - a fight that came to define the world we live in today. In the first episode, we see the origins of the Celts in the Alps of central Europe and relive the moment of first contact with the Romans in a pitched battle just north of Rome - a battle that the Celts won and that left the imperial city devastated.

The concept of a digital, decentralized currency is questioning things and the answers being spilled out are deep-seated, long-standing propositions that place a magnifying glass onto the seemingly untouchable financial institutions at the base of modern commerce. What may be uncovered in the philosophical, political, and economic questions could have radical implications for the rest of the 21st century". The documenteray ushers us in, not to explore simply Bitcoin, but to hint at the basis of trade, commerce, and civil society. Director Torsten's story of money is one filled with promise like a sunrise over a landscape of human spirit.

The digital era gives rise to unprecedented opportunity to exploit, and be exploited. Troves of child pornography are available at the click of a mouse. Who are these children - and who profits from their abuse? While facilitating the darker side of our impulses, technology is also being touted as a cure to rehabilitate predators. In this episode meet the children who are forced to perform sex acts on camera; people who use the same technology to protect kids and nab the perpetrators; plus, a pedophile who reveals the roots of his addiction.

Today, the topic of climate change is a major part of daily life, yet 40 years ago it was virtually unheard of. Since then, Horizon have followed scientists as they have tried to unpick how the climate works and whether it is changing. Dr Helen Czerski delves into this unique archive to chart the transformation of a little-known theory into one of the greatest scientific undertakings in history. It has been a constantly surprising journey of discovery that has revolutionised our understanding of climate, and seen scientists face unprecedented controversy and criticism.