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　　安慰剂可以被用来治疗常见的医学疾病吗？为了找到答案，《地平线》开始了一项具有里程碑意义的研究。100多名志愿者因背痛接受治疗，除了假药和精神力量，其它什么都不用。他们的大脑能产生比处方止疼药更好的疗效。但这个方法有用吗？当他们知道真相，他们会有怎样的反应？这部纪录片还将介绍世界上的其它实验，包括一名妇女通过接受假手术治疗慢性肩痛,另外，即使你知道自己吃的是安慰剂，它也会产生效果。

　　

　　Hannah Fry, a professor of maths, is used to investigating the world around her through numbers. When she's diagnosed with cervical cancer at the age of 36, she starts to interrogate the way we diagnose and treat cancer by digging into the statistics to ask whether we are making the right choices in how we treat this disease. Are we sometimes too quick to screen and treat cancer? Do doctors always speak to us honestly about the subject? It may seem like a dangerous question to ask, but are we at risk of overmedicalising cancer? At the same time, Hannah records her own cancer journey in raw and emotional personal footage, where the realities of life after a cancer diagnosis are laid bare.