Pyongyang, June 22 (KCNA) -- Advanced energy-conserving, green architectural technology is applied to the construction of Ryomyong Street in Pyongyang.

Pyongyang, June 22 (KCNA) -- The Nanotechnology Exhibition, run by the State Nanotechnology Bureau in the DPRK, plays a big role in promoting the development of the nation's nanotechnology.