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A muscle relaxant is a drug that affects skeletal muscle function and decreases the muscle tone. It may be used to alleviate symptoms such as muscle spasms , pain , and hyperreflexia . The term "muscle relaxant" is used to refer to two major therapeutic groups: neuromuscular blockers and spasmolytics .

Woodblock printing or block printing is a technique for printing text, images or patterns used widely throughout East Asia and originating in China in antiquity as a method of printing on textiles and later paper. As a method of printing on cloth, the earliest surviving examples from China date to before 220 AD.

A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.

Dad-windad (also spelled Dad-bendad) was a Parthian grandee, who served as the chief secretary of the last Arsacid monarch, Artabanus V (r. 213–224).He took part in the climatic battle of Hormozdgan in 224 between the Arsacid and Sasanian forces, which resulted in the defeat and death of Artabanus V, with Dad-windad meeting his end shortly afterwards.

Plato (c. 427 – c. 347 BC) placed the Sun second in order after the Moon. Martianus Capella (5th century AD) put Mercury and Venus in motion around the Sun. Ptolemy's authority was preferred by most medieval Islamic and late medieval European astronomers.

The Southern Qi began to fortify their capital, Jiankang, in order to prevent further Wei raids. Multiple sieges and skirmishes were fought until 481 but the war did not witnessed any major campaign. A peace treaty was signed in 490 with the Emperor Wu .

Early history (1958–1969) The creation of the Advanced Research Projects Agency (ARPA) was authorized by President Dwight D. Eisenhower in 1958 for the purpose of forming and executing research and development projects to expand the frontiers of technology and science, and able to reach far beyond immediate military requirements, the two relevant acts being the Supplemental Military ...