This water filter is just awesome

"The Drinkable Book is a life saving tool that filters water and teaches 

proper sanitation & hygiene to those in the developing world."

"Each book is printed in two languages on technologically advanced

filter paper, capable of killing deadly waterborne diseases. And each page 

is coated with silver nanoparticles, whose ions actively kill diseases 

like cholera, typhoid and E. coli."

"Once water is passed through the filter, bacteria count is reduced

by over 99.99%, making the filtered water comparable to tap water

in the United States of America."

"The paper costs only pennies to produce, making it by far the

cheapest option on the market. Each filter is capable of giving

someone up to 30 days worth of clean water. And each book is 

capable of providing someone with clean water for up to 4 years."

source