Chernobyl changed my mind about nuclear energy. I never really could understand how it happened, so my whole belief about it was "It's WAY too dangerous to risk using." But the TV show, as horrifying as it was, explained what happened in a way that was easier to understand. And when you get into just how many things were wrong, and just how extreme the conditions were, you realise that actually, when done correctly, it is actually very safe. Not 100% incapable of going wrong, of course, but safer than the death-traps-in-waiting I assumed them to be.