本部纪录片是BBC地平线系列推出的一档以“罪恶之种：大麻”为研究对象的纪录片。大麻，这种世界上最受欢迎的药物，却也是一种深受争议的植物。我们对于大麻的了解知之甚微，它真的能够引起精神分裂么？它会导致你上瘾么？它到底会让你越陷越深，还仅仅就是一种普通的药物呢？为了找寻答案，戒毒专家约翰·马斯登博士将应用现代科学去找到这些问题的答案。约翰追根溯源，来到大麻的诞生地哈萨克斯坦，并发现在一种原始海洋生物海鞘中有大麻类的最初物质，向我们展示出大麻到底对我们的大脑有什么样的影响。在研究过程中，约翰遇到了形形色色深受大麻影响的人群，有些还正处在毒瘾之苦中不能自拔，而有些已经脱离大麻过上了截然不同的全新生活。 　　地平线系列纪录片是英国广播公司BBC制作的一档流行并且播放已久的科学纪录片，于1964年5月2日首播，到2013年为止已有49个系列超过1100集。本系列纪录片从历史、人文、宗教、地理、设计、艺术、生物、哲学、环保、伦理等多个方面，提供世界上最伟大科学家和哲学家一个可以交流他们看法和观点的平台，并将他们对世界的新看法引入到我们的日常知识中来的科教节目。

For centuries we have dreamt of reaching the centre of the Earth. Now scientists are uncovering a bizarre and alien world that lies 4,000 miles beneath our feet, unlike anything we know on the surface. It is a planet buried within the planet we know, where storms rage within a sea of white-hot metal and a giant forest of crystals make up a metal core the size of the Moon. 　　Horizon follows scientists who are conducting experiments to recreate this core within their own laboratories, with surprising results.

如果你被问到“你知道现在的时间吗”，是否会觉得这是一个太过简单的问题？看看腕上的手表，或是翻出手机，精确到分秒的时间就能被轻易知晓。然而今天，粒子物理学家布莱恩·考克斯教授也如此问到。布莱恩探访了墨西哥的古玛雅金字塔，在那里古玛雅人是靠建神殿来计时的。他惊人地发现，符合地球本身规律的“时间”，从来都不是一天24小时。那么这个我们早已习以为常的“公理”，到底是个物质周期变化的规律，还是我们对于时间和空间认知上的一种错觉呢？ 　　此次BBC地平线系列纪录片的摄制组，将跟随布莱恩教授的脚步，从时间的起点开始入手研究，走访了多个支持“弦理论”的国度，并研究了时间的极限，试图解开这个抽象概念背后的神奇奥秘。

Around the world, a new generation of astronomers are hunting for the most mysterious objects in the universe. Young stars, black holes, even other forms of life. 　　They have created a dazzling new set of super-telescopes that promise to rewrite the story of the heavens. 　　This film follows the men and women who are pushing the limits of science and engineering in some of the most extreme environments on earth. But most strikingly of all, no-one really knows what they will find out there.

Horizon is BBC Two's flagship 50-minute science documentary series. In September 2004 it celebrated its 40th anniversary and it continues to enjoy outstanding critical acclaim. Recognised as the world leader in its field, it regularly wins a sweep of international science, medical and environmental film accolades, and has recently won the Royal Television Society Award and the Prix Italia. In 2002, the British Academy of Film & Television Arts presented Horizon with the BAFTA Television Award for Best Factual Series or Strand. In 2003 it won the prestigious Images et Science award for best medical documentary and the Carl von Linne Award at the Living Europe film festival in Sweden. That year, a Horizon co-production with WGBH Boston won the Emmy for best documentary.

David Baddiel, father of two, sets out to answer one of the greatest questions a parent can ask: how best to educate your child. 　　Taking in the latest scientific research, David uncovers some unconventional approaches: from the parent hot-hosing his child to record-breaking feats of maths, to a school that pays hard cash for good grades. 　　David witnesses a ground-breaking experiment that suggests a child's destiny can be predicted at four, and hears the three little words that can ruin a child's chance of success for good. He also uncovers the neurological basis for why teenagers can be stroppy and explosive and has his own brain tinkered with to experience what it is like to struggle at school. 　　Through it all, David's quest remains true: to maximise his child's potential for success and happiness.

2013年2月28日，佛罗里达坦帕市东郊住宅区，正在熟睡中的杰夫•布什和他的卧室突然消失得无影无踪。可怕的是，他消失前毫无征兆，杰夫从此杳无音信。他被陷穴吞没了。那么，陷穴是如何形成的？对于陷穴我们能做些什么？在这个不可思议的地理侦探故事片中，伊恩•斯图尔特博士发掘了地球几百万年的历史，以寻找这些问题的答案，并追问是否会有更多陷穴在我们身边出现。

Six months after the explosions at the Fukushima nuclear plant and the release of radiation there, Professor Jim Al-Khalili sets out to discover whether nuclear power is safe. 　　He begins in Japan, where he meets some of the tens of thousands of people who have been evacuated from the exclusion zone. He travels to an abandoned village just outside the zone to witness a nuclear clean-up operation. 　　Jim draws on the latest scientific findings from Japan and from the previous explosion at Chernobyl to understand how dangerous the release of radiation is likely to be and what that means for our trust in nuclear power.

味觉是我们最放纵的感觉，然而仅仅在过去几年中我们才逐渐开始理解为什么我们喜爱某些食物，而且其中的道理一定会让你大吃一惊，甚至有一种方法可以无须添加糖份而通过操纵你的大脑来使食物吃起来更甜。“地平线”节目组走访了一位种植出了最完美的番茄（比市面上的任何一种都要更甜、有更多的水分）的科学家，也拜访那些希望成为专业品尝师的人们。

第1集 　　在本集节目中团队提出了一个最基本的问题，猫如何通过看听和嗅，来认识周围的世界。对于人类来说视觉是主要的感官，那么猫呢？ 　　第2集 　　本节目将揭示你所喜爱的宠物，如何转变成好斗的猎食者。我们的猫和它们的大型猫科远亲有着相同的捕猎天性，它们也表现出了巡逻和保护自己领地的需要。但大型猫科动物是野生动物而猫找到了成为宠物的方法，那么它们是如何适应和发展出与人类共处的能力的呢。宠物猫似乎并不怕害我们，一些猫甚至积极地寻求我们的陪伴。 　　第3集 　　世界顶级的猫类科学家将进行一项史无前例的科学研究，来发现我们猫类朋友的秘密生活，向你展示不可思议的猫语，它们会发出颤音，会发出咘咘的有趣叫声。实验将向你展示猫如何让彼此知道它们是朋友亦或敌人，我们睡觉时它们有着不可思议的对话，以及它们为何如此让人喜爱。本期节目将向你揭示猫类的秘密语言以及它们对你的倾诉。