Nuclear bombs are easy to make, right? Find some uranium, shove in some explosives and — BOOM! — you’re quite literally done. Um, sorry, nope. The big problem in making a nuclear bomb is that you need enriched uranium, and that’s actually a real pain in the arse to make.
In this video, the engineering guy Bill Hammack explains why that’s the case — and why it means that, fortunately, nuclear weapons aren’t as widespread as you might expect. [YouTube]
European cities like Paris are much, much older than American cities like New York, and that age difference has led to many interesting differences in the layout of each city. For example, the wealthy population of America often live in suburbs away from the city while in Europe, the rich live inside the city. Why is that?