Interesting, Life Hacks
Why This Reservoir Is Being Filled With 96,000,000 Black Balls
This is not a kiddie pool. This is a reservoir of a water company in Los Angeles. The balls are made of high-density polyethylene (HDPE) which is less dense than water so they float on the surface of the reservoir even if they break apart. If these black balls are not being used to shade the water to reduce evaporation, what is the reason they were put there?