400,000 Bouncy Black Balls Invade Reservoir to Save Los Angeles From Cancer Water

From gizmodo:

While yesterday the world was ogling over the iPhone 3G black body, some people were just awing over black balls. 400,000 of them. Black balls everywhere, bouncing, swinging, cavorting, happily hopping down the side of the Ivanhoe Reservoir with two objectives. First, to fight bromate by stopping sunlight, which forms this carcinogenic component mixing the chlorine and bromide in the water.
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