NASA Astronaut Group 21 of more than 18,300). Traditionally, the upcoming class is given a nickname by the previous class. Following this custom, the class of 2009 (also known as "The Chumps") christened the 2013 class the "Eight Balls" in reference to the fact that there are eight of them. In an interview with Bob Behnken, then Chief of the Astronaut Office, stated that the name further represents that, "The eight ball [in billiards or pool] is played last and the hope from the preceding class is that the [2013 astronaut candidates] will be assigned after all of them [fly]." The team consists of
Chinese as a foreign language Chinese language proficiency exam program, which tests has been taken around 100 million times (including by domestic ethnic minority candidates). Within China's Guangdong Province, Cantonese is also offered in some schools as optional or extra-curricular courses in select Chinese as a foreign language programs, although many require students to be proficient in the Mandarin first. Chinese is rated as one of the most difficult languages to learn for people whose native language is English, together with Arabic, Japanese and Korean. According to the Foreign Service Institute, a native English speaker needs over 2,200 hours of intensive study, taking 88 weeks