Credit: Mona Mijthab/Flickr So your family of four has been using a mobile sanitation toilet for a week, and now you've got 35 liters of human waste that you desperately need to sterilize. Thanks to a new invention, all you need is some sunshine, a little water, and a dash of gold nanoparticles. These tiny metallic shells absorb so much energy from sunlight that they can transform water into steam at temperatures well below the liquid's usual boiling point of 100°C. In a new study, engineers show that they can use gold nanoparticles to build solar-powered sterilization systems that...