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http://en.wikipedia.org/wiki/Saudade

Saudade

Saudade ( European Portuguese: [sɐwˈðaðɨ] , Brazilian Portuguese: [sawˈdadi] or [sawˈdadʒi] , Galician: [sawˈðaðe] ; plural saudades ) [ 1 ] is a Portuguese word that has no direct translation in English . It describes a deep emotional state of nostalgic longing for an absent something or someone that one loves. Moreover, it often carries a repressed knowledge that the object of longing will never return. [ 2 ] A stronger form of saudade may be felt towards people and things whose whereabouts are unknown, such as a lost lover, or a family member who has gone missing. Saudade was once described as "the love that remains" after someone is gone. Saudade is the recollection of feelings, experiences, places or events that once brought excitement, pleasure, well-being, which now triggers the senses and makes one live again.
http://www.utexas.edu/news/2010/10/04/language_relationships/

What Mimicking One's Language Style May Mean About the Relationship | The University of Texas at Austin

Oct. 4, 2010 AUSTIN, Texas — People match each other's language styles more during happier periods of their relationship than at other times, according to new research from psychologists at The University of Texas at Austin. "When two people start a conversation, they usually begin talking alike within a matter of seconds," says James Pennebaker, psychology professor and co-author of the study. "This also happens when people read a book or watch a movie. As soon as the credits roll, they find themselves talking like the author or the central characters."
http://www.news.cornell.edu/stories/May11/RunningMice.html May 11, 2011 Study traces the neural wiring of a running mouse Cornell researchers have identified a group of spinal cord nerve cells that manages running in mice. In the process they have illuminated an interesting step in mouse evolution: When you're being chased by a hawk, you're better off scampering than galloping, even though galloping is faster. Described in the April 17 online issue of the journal Nature Communications, the research is part of an ongoing effort to learn more about locomotion in animals, essentially by creating a wiring diagram of the locomotor networks in the spinal cord, said Ronald Harris-Warrick, professor of neurobiology and behavior. Walking and running share common but overlapping processes in most animals.

Study traces neural wiring of a running mouse

Philosophy