And maybe some salt: Scientists propose simple fix for world crisis
                                
                                
                                    (Newser) -
                                    One in 6 people in the world faces a clean-water shortage, according to the United Nations—so scientists are proposing a quick fix. Dirty water can be rendered drinkable using a few odd ingredients: Sun, salt, dirt, and lime,  NPR  reports. The sun's rays can kill the germs in...