>>basically cleverly mixed soil Very carefully selected soil, where conditions are correct to achieve exponential growth in reactions. Not all elements are fi

>>basically cleverly mixed soil Very carefully selected soil, where conditions are correct to achieve exponential growth in reactions. Not all elements are fissile. I didn't really understand this till recently- so I thought I'd share. Propaganda films from the 50s celebrating the Power of the Atom are a little broad in their claims. https://en.wikipedia.org/wiki/Nuclear_fuel https://en.wikipedia.org/wiki/Nuclear_fuel