Ted is a brilliant platform and resource which houses thousands of informative and educational short talks from people of all walks of life. I know a few members here have already discovered Ted..
Ted Talk - How to Spot a Liar - By Pamela Meyer
http://www.ted.com/talks/pamela_meyer_how_to_spot_a_liar
Jon Ronson - Strange Answers to the Psychpath Test
https://www.youtube.com/watch?v=d0UFU2gp7oQ&app=desktop