question: Nancy Langston is a professor at the college located in what Michigan city?
answer: Houghton
context: Title: Nancy Langston
  Passage: Nancy Langston is an American environmental historian, currently working as a professor in the Department of Social Sciences at Michigan Technological University.  She was the President of the American Society of Environmental History from 2007 to 2009.  Her initial research on the historical and spatial migrations of toxic contaminants within the Lake Superior basin was supported by the National Science Foundation, and has informed her most recent publication titled Toxic Bodies.
  Title: Michigan Technological University
  Passage: Michigan Technological University (commonly referred to as Michigan Tech, MTU, or simply Tech) is a public research university located in Houghton, Michigan, United States.  Its main campus sits on 925 acre on a bluff overlooking Portage Lake.  Michigan Tech was founded in 1885 as the first post-secondary institution in the Upper Peninsula of Michigan, and was created to train mining engineers to operate the local copper mines.
  Title: Indiana State Road 520
  Passage: State Road 520 is a four-lane connector about 1,000 feet (305 m) in length.  It exists solely to connect U.S. Route 12 and U.S. Route 20 in Pines, about 3 miles (5 km) west of Michigan City.  U.S. 12 and U.S. 20 do not cross at this point — they parallel each other for another 22 miles (35 km) westbound and overlap in Gary; U.S. 20 is generally considered the faster of the two, while U.S. 12 is the scenic Dunes Highway.  Eastbound, U.S. 12 travels through Michigan City and northeast into Michigan where it forks east from the Red Arrow Highway.  U.S. 20 stays in Indiana and runs around Michigan City as a bypass to the south.
citations: Nancy Langston Michigan Technological University