Since 1990, 2.6 billion people have gained access to uncontaminated sources of water, according to the World ... a year's worth of paper filter pages into what they call the "drinkable book ...

Each of its pages is made from a thick sheet of paper impregnated with silver and copper nanoparticles, that kill 99.9 percent of microbes in tainted water that’s filtered through it.

The next stage is to test the books in larger trials where they are used by local residents A book with pages that can be torn out to filter drinking water has proved effective in its first field ...