一打开水龙头，水便源源流出，但自来水真的安全吗？2014年，美国芬林市为了节省开支而改变食水来源，却因处理食水时遗漏一个重要程序，令水管腐蚀，酿成铅水危机，危害数以千计居民的健康。本集将会解构这场人祸背后各方面：由复杂的水化学，到人体中铅毒的反应，以及科学被滥用的祸害。最后受害居民如何与科学家联手，逼使政府承认失误、负起责任，为芬林市善后？受铅祸所害的不只美国芬林市，市民该如何保障自己？

电视版本：双语广播（粤语／英语）

Water. Turn on the faucet and it is always there. Without it we perish. But how safe is tap water? In this episode, we investigate what happened in Flint, Michigan when local officials changed the city’s water source to save money, but overlooked a critical treatment process. As the water pipes corroded, lead leached into the system, exposing the community—including thousands of children—to dangerous levels of poison. Ordinary citizens and independent scientists exposed the danger lurking in Flint’s water and confronted those who turned a blind eye. Join us as we uncover the science behind this manmade disaster—from the intricacies of water chemistry, to the biology of lead poisoning, to the misuse of science itself. Still, there is a disturbing truth that reaches far beyond Flint. How can we protect ourselves from poisoned water?

TV Version: Bilingual Broadcast (Cantonese/English)