This will NEVER happen. For one thing, it would be trivial for us to re-learn how to make one. The folks that had NEVER invented one did it in short order wit

This will NEVER happen. For one thing, it would be trivial for us to re-learn how to make one. The folks that had NEVER invented one did it in short order without computers and specialized equipment. They weren't even sure they'd be successful the first go around. Possessing this knowledge would be very useful in a world where other nations didn't have it. Just look at history to know the reason why. The only thing stopping the spread of this knowledge is the early warning provided by watching for the attempts of governments to acquire it themselves. Once you know they are trying, you use political/economic/military pressure to force them to abandon the effort. In some cases that works (South Africa). In some cases it doesn't (North Korea).