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Hints:
1990s
Bangladesh
Bangladeshi

People around the world rely on groundwater as a safe drinking source. But, as University of Wisconsin hydrogeologist Jean Bahr notes, groundwater can sometimes contain toxic substances - like arsenic.

Jean Bahr: [---1---] But it wasn't on our list of things we analyzed for regularly outside of those areas.

[---2---]

[---3---] Bahr added that, today, scientists look for broader features to suggest the presence of arsenic.

Jean Bahr: Is there arsenic in the rocks of sediments? And then, are the conditions of the waters, water chemistry conducive to actually dissolving those minerals and releasing the arsenic?

[---4---]

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【視聽版科學(xué)小組榮譽(yù)出品】
We know that in areas of volcanic activity, in areas where metallic mines occur that arsenic is a common constituent in the groundwater. Bahr said that changed in the 1990s, when health care workers in Bangladesh discovered that arsenic in the groundwater had been causing widespread illness. She said the incident surprised scientists, because the Bangladeshi groundwater source wasn't near a volcano or a mine. Bahr suggested that water drawn from private wells be tested for potential toxic substances.