一打開水龍頭，水便源源流出，但自來水真的安全嗎？2014年，美國芬林市為了節省開支而改變食水來源，卻因處理食水時遺漏一個重要程序，令水管腐蝕，釀成鉛水危機，危害數以千計居民的健康。本集將會解構這場人禍背後各方面：由複雜的水化學，到人體中鉛毒的反應，以及科學被濫用的禍害。最後受害居民如何與科學家聯手，逼使政府承認失誤、負起責任，為芬林市善後？受鉛禍所害的不只美國芬林市，市民該如何保障自己？

電視版本：雙語廣播（粵語／英語）

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)