Bottled water versus tap

Bottled water sales are way, way up, thanks in part to marketing claims that it is cleaner than tap water. But drinking from plastic poses a real danger, according to experts and studies. Read about it in this piece for The Revelator. 

The sources of Earth's water

 Earth has a lot of water. Scientists aren't sure where it all came from, but they may be getting close to finding out. Read more here.