[youtube]http://www.youtube.com/watch?v=E94xTxEydN4&mode=related&search=[/youtube]

[youtube]http://www.youtube.com/watch?v=Xw9SE315GtA&mode=related&search=[/youtube]

[youtube]http://www.youtube.com/watch?v=LOdre3Bra8o&mode=related&search=[/youtube]

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

The studys' findings are interesting.