I saw this documentary on Netflix about the inventor Dean Kamen and his water purification device called ‘Slingshot’. The device can distill all kinds of dirty water and make it drinkable – a great benefit for people especially in developing countries, where so many get sick and die from drinking water filled with bacteria. But clean drinking water will also become more scarce in the Western world in following decades, so a machine like this can become very important all over the world. Already scientists have discovered large amounts of drugs and hormones from birth control pills in the tap water, which has lead some scientists to speculate, that it has an effect on when girls go into puberty.