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Utah scientist suspects pond scum triggers brain diseases in certain people
"And if you forget everything else I say as you walk out of here," Cox said, "please make sure that you do not ever drink green, smelly water." That's a reference to cyanobacteria, a bluish-green scum on ponds, lakes and oceans. It's found worldwide, and it sometimes blooms into thick, gigantic mats of ooze. Often called "blue-green algae," it's not true algae. It's a photosynthetic bacteria. Ref. Source 8