Comment by titzer

> Those are incredibly difficult problems, and each one keeps getting worse.

Indeed, so hard that it took until 1957 for the US to master them....

Not trivialize the effort of making such rockets and reentry vehicles, but the North Koreans only have 6-10 countries to follow, at least two of which are semi-friendly to them and two more that they could crib tech from. Oh, and they have computers and it's not the 1950s anymore.