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...free. These are known as meteorites and have fallen to Earth for billions of years. Meteorites often originate from asteroids, but they can also come from comets and even planets. They give scientists the chance to sample a huge variety of space rocks, without leaving the safe confines of planet Earth. But these samples represent a challenge for scientists. The meteorites...

...free waste stream, scientists, engineers and entrepreneurs have looked into various ways of putting it to use. Burn coffee for low-cost fuel For a few years now, Nestlé has been using waste coffee grounds from its instant soluble coffee production as thermal fuel. It currently uses coffee to cook the food it produces in more than 20 factories globally, displacing more...