North Korea will build a solid-fuel intercontinental ballistic missile, dictator Kim Jong Un announced last week. An ICBM with solid fuel is simpler, safer, potentially more reliable and—because it doesn’t require as much support equipment—easier to hide and launch than a liquid-fuel rocket is. It’s not for no reason that the United States, Russia and other major powers mostly deploy solid-fuel nukes. Now the Democratic People’s Republic of Korea is on track… – Forbes Photo: KCNA