A zoologist with the Meghalaya Pollution Control Board tests the acidity of the Lukha River. The otherwordly blue waters had a pH of 4.5, sufficient acidity to kill fish. (Dhruv Malhota/Contact Press Images for Circle of Blue)

A zoologist with the Meghalaya Pollution Control Board tests the acidity of the Lukha River. The otherwordly blue waters had a pH of 4.5, sufficient acidity to kill fish. (Dhruv Malhota/Contact Press Images for Circle of Blue)

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