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

The car has shrunk the world, increased personal freedom and in so many ways expanded our horizons, but there is a flipside. Fumes from car exhausts have helped to destroy our environment, poisoned the air we breathe and killed us in far more straightforward ways. But all that is going to change. This episode enters a world where cars can drive themselves, a world where we are simply passengers, ferried about by wholesome green compassionate technology which will never ever go wrong. And it is almost here. Horizon explores the artificial intelligence required to replace human drivers for cars themselves, peers into the future driverless world and discovers that, despite the glossy driverless PR (and assuming that they really can be made to work reliably), the reality is that it might not be all good news. From the ethics of driverless car crashes to the impact on jobs, it might be that cars are about to rise up against us in ways that none of us are expecting.

最可怕的侏罗纪怪物 重现眼前 暴龙、三角龙、速龙、甲龙 埋身肉搏 誓要找出恐龙杀手 我们知道牠们有的巨型，有的恐怖…但直到这刻我们才清楚恐龙的真面目。新近的研究，让生物力学、电脑图像界面和特别效果製成最精确的恐龙杀手。每一个科学测试，都令人毛骨悚然。 我们透过分析这些大型生物的视觉、脑力、速度、灵敏度、攻击性和防卫能力，为恐龙与恐龙设置战场，进行终极巨人之战。揭开真相和未知有关恐龙和牠们史前生活的传说。製造和测试恐龙的杀人武器：液压顎，能刺破硬物的角，如剃刀般锋利的爪和棒形尾部。 暴龙对三角龙 史上最“巨型”的战事。一边是最有名的杀手，牠重六吨，拥有强而有力的肌肉和牙齿，而顎更能撕破一架汽车。而牠的对手正是拥有杀人武器，体型巨大的三角龙。 速龙对甲龙 当传说遇上怪物。史匹堡於《侏罗纪公园》中，描述的速龙是否正确？抑或真相比电影更要可怕？当牠遇上有如坦克车般，穿上装甲和带着棒形尾巴的甲龙时，又会有什么事发生？

We know what 4% of the Universe is made of. But what about the rest? There was a time, not so long ago, when science seemed to understand how the universe worked. Everything – us, the Earth, the stars and even exotic-sounding supernovae – was made of atoms which were all created at time-zero: the Big Bang. In between the atoms was nothing, a void: quite literally, 'space'. But recently things have started to unravel. There is, it seems, a lot more to the universe than meets the eye. According to the best estimates, we only really know what about 4% of it is made of. But if only 4% is made of atoms, what about the rest? The rest is made of mysterious entities about which very little is understood, with equally mysterious names: dark matter and dark energy.

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.

Time travel is not forbidden by the laws of nature, but to build a time machine, we would need to understand more about those laws and how to subvert them than we do now. And every day, science does learn more. In this film Horizon meets the scientists working on the cutting edge of discovery - men and women who may discover how to build wormholes, manipulate entangled photons or build fully functioning time crystals. In short, these scientists may enable an engineer of the future to do what we have so far been only able to imagine - to build a machine that allows us travel back and forward in time at the touch of a button. It could be you! Science fiction? Watch this space.

人为什么会笑？笑的本质是什么？笑声在社交中有什么作用？大脑能分辨真笑和假笑吗？存在全世界通行的喜剧吗？

Most of us think that Obsessive Compulsive Disorder (OCD) is just over fussy tidying. But it's actually much more serious. Sophie has to check that she hasn't killed people, looking for dead bodies wherever she goes, Richard is terrified of touching the bin, and Nanda is about to have pioneering brain surgery to stop her worrying about components on her body - that her eyebrow might not be aligned or that she has bad breath. Professor Uta Frith meets the people living with OCD, looks at the therapy available and asks what neuroscience can offer by way of a cure.