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Alcohol and drug researcher James Lange describes how YouTube videos of drug use have improved the speed and quality of his research, and argues that they can be a vital tool for scientists.

Dr. Lange's research has been into salvia divinorum, and he explains how new technology could now make his job even easier.

He argues that YouTube is an incredible archive of social and biological behaviour, which did not exist a few years ago, and that using it in a sophisticated and systematic way can help us to quickly understand complicated behaviour.

Four Thought is a series of talks which combine thought provoking ideas and engaging storytelling.

Recorded in front of an audience at the RSA in London, speakers take to the stage to air their latest thinking on the trends, ideas, interests and passions that affect our culture and society.

Producer: Giles Edwards.