Some of the biggest ideas may also be the smallest. A few decades ago, the word was hardly in our language, and while many people today still might not know what it is, it's changing the way we live.

An Air Force-supplied filter being given to Fountain to strain out toxic chemicals from drinking water appears susceptible to a host of newly discovered compounds, a new study shows. That type of ...

Environmental activists threw black liquid into the waters of a Roman fountain in Piazza di Spagna in the Italian capital, Rome, during a protest in which they spoke of the "end of the world" scenario ...