This looks like fun:
Dr. Chae Yeon-seok of the Korea Aerospace Research Institute said Friday he has built a replica of the 14th-century weapon which can fire arrows 150 meters, and that he sucessfully tested it.
The artillery piece, 30.2 cm long and 4.6 cm in diameter, was a state-of-the-art weapon in Northeast Asia at that time in terms of its power and range. It is believed to have been invented by a scientist during the Goryeo Kingdom (918-1392).
The replica was constructed according to an original that had been passed from one owner to another, including antique dealers, over the years. Chae built the replica after being asked recently to determine its authenticity.
The original has an inscription reading "18th year of Hongmu," which was the 11th year of the reign of King U of the Goryeo Kingdom or 1385 A.D.
If the inscription is accurate, the gun is the oldest in Korea, apprently produced by scientist Choi Mu-seon of the "Hwatongdogam," a state agency established to produce artillery, in 1377, Chae said.
Can I blow up something next?