input: On 31 May 2012, Lidstrom announced his retirement from the NHL via a press conference with Red Wings Owner Mike Ilitch and General Manager Ken Holland present. The night before, he told the Swedish tabloid Expressen, "I came to the decision last week and I informed our general manager, Ken Holland." Discussing Lidstrom's retirement, former teammate Steve Yzerman described Lidstrom as "one of the all-time best defencemen to ever play." Paul Coffey said, "he was an incredible player" while Chris Chelios said, "There's been guys who are great players, but no one's better than Nick. As good? Yes. But this is as big as it gets. He's one of the best athletes ever and...if you're going to talk about someone who's perfect, Nick's pretty darn close to being perfect." Washington Capitals defenceman John Carlson described Lidstrom as "one of the game's all-time greats on and off the ice." Ken Holland stated his belief that Lidstrom was "the most valuable player of his era."  The following weekend, on 3 June 2012, Lidstrom and his wife took out a full-page ad giving thanks to the city of Detroit for making his family feel at home for the past 21 years. On 8 July 2012, Lidstrom was named a scout for the Red Wings.  On 28 February 2014, Lidstrom was inducted into the Michigan Sports Hall of Fame.  During the 2013-14 season, Lidstrom had his number 5 jersey retired by the Red Wings. Initially, ceremonies were planned for the previous season, on 5 February 2013 -- however, the lockout had made it hard to determine when Lidstrom would able to attend the ceremony. The Red Wings officially retired his number on 6 March 2014, in a pre-game ceremony at Joe Louis Arena.

Answer this question "when did he retire?"
output: On 31 May 2012, Lidstrom announced his retirement from the NHL

input: The supposed origin of the Cimmerians north of the Caucasus at the end of the Bronze Age loosely corresponds with the early Koban culture (Northern Caucasus, 12th to 4th centuries BC), but there is no compelling reason to associate this culture with the Cimmerians specifically.  There is a tradition in archaeology of applying Cimmerian to the archaeological record associated with the earliest transmission of Iron Age culture along the Danube to Central and Western Europe, associated with the Cernogorovka (9th to 8th centuries) and Novocerkassk (8th to 7th centuries) between the Danube and the Volga. This association is "controversial", or at best conventional, and is not to be taken as a literal claim that specific artifacts are to be associated with the "Cimmerians" of the Greek or Assyrian record.  The use of the name "Cimmerian" in this context is due to Paul Reinecke, who in 1925 postulated a "North-Thracian-Cimmerian cultural sphere" (nordthrakisch-kimmerischer Kulturkreis) overlapping with the younger Hallstatt culture of the Eastern Alps. The term Thraco-Cimmerian (thrako-kimmerisch) was first introduced by I. Nestor in the 1930s. Nestor intended to suggest that there was a historical migration of Cimmerians into Eastern Europe from the area of the former Srubna culture, perhaps triggered by the Scythian expansion, at the beginning of the European Iron Age. In the 1980s and 1990s, more systematic studies[by whom?] of the artifacts revealed a more gradual development over the period covering the 9th to 7th centuries, so that the term "Thraco-Cimmerian" is now rather used by convention and does not necessarily imply a direct connection with either the Thracians or the Cimmerians.

Answer this question "Are there any other archaeologist other than Paul Reinecke mentioned regarding the CImmerians?"
output: 

input: As a first-year student at Harvard University in fall 1970, Stallman was known for his strong performance in Math 55. He was happy: "For the first time in my life, I felt I had found a home at Harvard."  In 1971, near the end of his first year at Harvard, he became a programmer at the MIT Artificial Intelligence Laboratory, and became a regular in the hacker community, where he was usually known by his initials, RMS (which was the name of his computer accounts). Stallman received a bachelor's degree in physics (magna cum laude) from Harvard in 1974.  Stallman considered staying on at Harvard, but instead he decided to enroll as a graduate student at MIT. He pursued a doctorate in physics for one year, but left that program to focus on his programming at the MIT AI Laboratory.  While working (starting in 1975) as a research assistant at MIT under Gerry Sussman, Stallman published a paper (with Sussman) in 1977 on an AI truth maintenance system, called dependency-directed backtracking. This paper was an early work on the problem of intelligent backtracking in constraint satisfaction problems. As of 2009, the technique Stallman and Sussman introduced is still the most general and powerful form of intelligent backtracking. The technique of constraint recording, wherein partial results of a search are recorded for later reuse, was also introduced in this paper.  As a hacker in MIT's AI laboratory, Stallman worked on software projects such as TECO, Emacs for ITS, and the Lisp machine operating system (the CONS of 1974-1976 and the CADR of 1977-1979--this latter unit was commercialized by Symbolics and LMI starting around 1980). He would become an ardent critic of restricted computer access in the lab, which at that time was funded primarily by the Defense Advanced Research Projects Agency. When MIT's Laboratory for Computer Science (LCS) installed a password control system in 1977, Stallman found a way to decrypt the passwords and sent users messages containing their decoded password, with a suggestion to change it to the empty string (that is, no password) instead, to re-enable anonymous access to the systems. Around 20% of the users followed his advice at the time, although passwords ultimately prevailed. Stallman boasted of the success of his campaign for many years afterward.

Answer this question "what did he study at harvard?"
output:
Stallman received a bachelor's degree in physics (magna cum laude) from Harvard in 1974.