Last updated at 12:56

How can pages from a book purify dirty water?

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A book with special pages has been developed by scientists to help people in third world countries drink clean, safe water.

The pages of this special book help people because they get rid of harmful germs so that dirty water is made safe to drink.

In some countries it can be really hard for people to find clean drinking water.

The germs in dirty water can make people very ill.