Astronaut propulsion unit Astronaut propulsion unit An astronaut propulsion unit (or astronaut maneuvering unit) is used to move an astronaut relative to the spaceship during a spacewalk. The first astronaut propulsion unit was the Hand-Held Maneuvering Unit (HHMU) used on Gemini 4. The Hand-Held Maneuvering Unit was the EVA "zip" gun used by Ed White on the Gemini 4 mission in 1965. The hand-held gun held several pounds of nitrogen, and allowed limited movement around the Gemini spacecraft. It was also used by astronaut Michael Collins on the Gemini 10 mission in 1966. The United States Air Force (USAF) Astronaut Maneuvering Unit (AMU)
Chinese as a foreign language Chinese in Europe. In 1837, Nikita Bichurin opened the first European Chinese-language school in the Russian Empire. Since then sinology became an academic discipline in the West, with the secular sinologists outnumbering the missionary ones. Some of the big names in the history of linguistics took up the study of Chinese. Sir William Jones dabbled in it; instigated by Abel-Rémusat, Wilhelm von Humboldt studied the language seriously, and discussed it in several letters with the French professor. Local Chinese variants were still widely used up until a Qing dynasty decree in 1909 that mandated Mandarin as the official language of