A new initiative by the Los Angeles Department of Water and Power (LADWP) has taken a surprisingly low-tech approach to water conservation, by covering the LA Reservoir in 96 million black "shade balls." It's an attempt to combat water loss through evaporation, and to heighten water quality.
If you're enjoying a serene natural area, you might not appreciate
seeing a very techy-looking pollution-hunting robot putting along the
surface. That's why scientists at the National University of Singapore
have developed an alternative – water-quality-monitoring robots that
look like swans.