In many regions of Europe, wild boars roam the landscape. Also, they're radioactive. For a long time, it was assumed the Chernobyl disaster was the cause, and that's still partly true. But the real answer goes back even further, and offers us a glimpse of how the byproducts of nuclear technology can lay dormant for decades, only detected in the most visible part of a system we're still learning to understand.This is the wild boar paradox, and this is what it can teach us about nuclear technologies past, present and future...GUEST: Becky Ferreira, science writer, regular contributor at Motherboard