View Larger Ivanhoe Reservoir, Los Angeles
Photo: Gerd Ludwigin 2007, high levels of bromate - a carcinogen formed when bromide and chlorine react with sunlight - were found in Los Angeles’s Ivanhoe Reservoir. Today three million black plastic balls help deflect UV rays.



![daily-tumbles:
“Don’t play with the humans, dear.”
[video]
Following this blog will be the best thing you ever do](http://24.media.tumblr.com/tumblr_lw7fb9oGMc1qzrlhgo1_250.gif)
![daily-tumbles:
“Don’t play with the humans, dear.”
[video]
Following this blog will be the best thing you ever do](http://30.media.tumblr.com/tumblr_lw7fb9oGMc1qzrlhgo2_250.gif)

























