There were reports going around last month that North Korea had tested another solid-fuel missile engine, a type of engine that can be deployed much faster than the older liquid-fueled ones.

Kim Jong Un’s media outlets hadn’t bragged about it — as they had done previously — so the experts at the Middlebury Institute of International Studies’ nonproliferation center got to work.

They figured that the North Korean rocket scientists would have used the same immovable concrete block they used for an engine test last year.

 

Read the whole story from The Washington Post.