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 late 16th century. Among the first were the Italian Jesuits, Michele Ruggieri and Matteo Ricci. They mastered the language without the aid of any grammar books or dictionaries, and are often viewed as the first Western sinologists. Ruggeiri set up a school in Macau, which was the first for teaching foreigners Chinese and translated part of the "Great Learning" into Latin. This was the first translation of a Confucian classic into any European language. He also wrote a religious tract in Chinese, the first Chinese book written by a Westerner. Matteo Ricci brought Western sciences to China, and became a