Water, water everywhere - but if it's not properly cleaned, it can be deadly.
One D.C.-area inventor might have come up with an easy-to-use, widely deployable solution to cleaning the dirty water that people are stuck with, and she did it right in her backyard. Check it out and share your ideas on how to ensure clean water for all.
An earlier version of this graphic incorrectly stated that 2.5 times the population of the United States dies each year from drinking contaminated water. This is, in fact, the number of people who lack access to clean water worldwide. The graphic has been updated to reflect this information.