Acting Purdue President Tim Sands is asking that Purdue flags on campus be flown at half-staff to remember Neil Armstrong, a Purdue alumnus who became the first human to set foot on the moon. Armstrong died Saturday [Aug 25] at the age of 82.  Sands says Armstrong was "a humble and private person, but always willing to talk to students."  Armstrong earned a bachelor's degree from Purdue in aeronautical engineering in 1955 and was awarded an honorary doctorate in engineering from Purdue in 1970. On July 20, 1969, Armstrong became