What is manganese, anyway?

Memorial University chemistry professor Chris Kozak explains the connection between manganese and the City of St. John's water supply, after a warning that too much of the chemical element was found in the Petty Harbour-Long Pond supply.
Read more: www.cbc.ca/1.4802159
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[@understoodish]

It's a good video and demonstration, but does it answer the video title's question?