The stink may be what you first think of when you think of sulphur - many describe it as acrid or smelling like rotten eggs. But as one expert explains, it may be toxic but it is very useful to humans and society. It plays a key role in the body and has many industrial uses. It is used for making car batteries, fertilizer, oil refining, water processing, mineral extraction, and much more. This Element of Surprise segment features the following experts: Keiko Hattori, Professor, Geochemistry, University of Ottawa, and Ian Douglas, Water Quality Engineer, City of Ottawa.

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