Lie detector

Bibliography:

Bonsor K. (2014). How Lie Detectors Work. Recovered on may 28 of 2014, http://people.howstuffworks.com/lie-detector.htm.

Bellis M.(2014). History of the Lie Detector or Polygraph Machine. Recovered on may 26 of 2014, http://inventors.about.com/od/fstartinventions/a/forensic_2

Images taken from internet (Google) : 

1. http://static.guim.co.uk/sys-images/Sport/Pix/pictures/2010/12/15/1292442044377/Lie-detector-mcc-match-fi-007.jpg
2. http://i.telegraph.co.uk/multimedia/archive/01378/lie_detector_1378435c.jpg
3. http://www.alchemyofchange.net/wp-content/uploads/2013/09/Lie-Detector.jpg
4. http://i.telegraph.co.uk/multimedia/archive/02446/lie-detector_2446696k.jpg

Maria Camila Peralta, Alejandra Arenas and Juliana Gonzalez