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In the early 15th century, Buddhist monks maintained hanjeungmak clinics, called hanjeungso, to treat sick poor people; these clinics maintained separate facilities for men and women due to high demand.In 1961, Kim Bong-han, a North Korean medical surgeon, first discovered a new circulatory system outside of the body’s blood vessels, nervous system or lymphatic system. He postulated that the third vascular system cannot be associated with either the blood vessel system or the lymphatic system.Greenhouses in which the temperature could be manually manipulated first appeared in 15th century Korea.The 15th century treatise, the Sanga Yorok, contains descriptions of greenhouses designed to regulate the temperature and humidity requirements of plants and crops.
The cheonbochong (천보총/千步銃), or the "thousand paces gun", was a type of jochong matchlock musket invented in Joseon during the reign of King Sukjong (1674–1720).
It was projected into enemy camps and formations using the wangu mortar, and also used at sea.
The Bigeo (비거/飛車) was a manned glider-based attack and reconnaissance aircraft invented by Jeong Pyeong Gu (정평구) in 1592 to gain a tactical advantage against the Japanese in the Imjin War.
However, the Cheonsang Yeolcha Bunyajido's stellar positions indicate an epoch dating back to the first century AD, thus making it the oldest actual representation of the stars in the world.
It was constructed in Seorabeol, the capital of Silla, during the reign of Queen Seondeok in the 7th century.