With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Emilio Estevez is an actor.
text_B: The Museum of Vision Science is a museum with physical and virtual displays of vision-related devices and instruments , located at the University of Waterloo in Waterloo , Ontario , Canada .. University of Waterloo. University of Waterloo. Waterloo. Waterloo, Ontario. Ontario. Ontario. Canada. Canada. It is housed at the university 's School of Optometry .. School of Optometry. University of Waterloo School of Optometry. It has free admission , and is open during weekdays .. In June 2009 , it was relocated to its present site after the completion of a new wing to the optometry building .
not_related.