It's colorless, odorless and definitely life-sustaining, but is it invisible to the naked eye? Not usually. So what's going on with everyone's favorite liquid?
The dead zone, caused by massive amounts of algae growth, is a vast area off the Gulf of Mexico that is deadly to marine life. How is human activity making the dead zone worse? See more »
Seventy percent of the Earth's fresh water is in polar ice caps, the those caps calve icebergs all the time. So why can't we use those icebergs to provide fresh water that so many countries are in desperate need of? See more »
What's as big as a continent and sitting in the middle of the Pacific Ocean? A pile of garbage that extends 100 feet (30 meters) below the surface of the water. See more »
If you ask anyone interested in surfing, they'll probably tell you that you need to be on the West Coast in order to find the biggest waves. But why is that? Why are the waves bigger on the West Coast when compared to the East Coast of the U.S.? See more »